Split-sole footwear

Abstract

To provide improved foldable shoe designs and improved shoe manufacturing processes.SOLUTION: A shoe comprising an upper forming an interior portion for a foot, the interior portion including toe and heel cavities, is provided. The shoe further comprises a midsole having toe and heel ends and inner and outer sides. The midsole is stitched to the upper thereby forming a bottom to the interior portion. Heel and toe outsole patches are respectively stitched onto the midsole. An insole is affixed to the bottom of the interior portion. A spacing between the heel and toe outsole patches extends from the inner to the outer side and occupies a position intermediate between the toe and heel ends, thereby permitting the shoe to fold about an axis running through the spacing. The shoe folds between an extended state in which the shoe is worn, and a folded state in which a portion of the upper comprising the toe cavity is tucked into the heel cavity.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Cross - Reference to Related Applications This application claims priority to U.S. Patent Application No. 13 / 207,397, filed on August 10, 2011, entitled "Split - Sole Footwear".

[0002] This disclosure relates to footwear, and more particularly to split - sole shoes.

Background Art

[0003] Conventional footwear has structural limitations that impose difficult choices on the wearer between style and comfort. As a result, many people have to endure significant foot pain or choose shoes that are not very attractive or styles inappropriate for the situation. To solve this problem, some women keep additional footwear in their cars or carry it in large bags. However, carrying spare conventional shoes is hardly ideal because of dimensional and volumetric limitations with respect to portability. Footwear with excellent portability that can be lightweight and rolled up or folded is available. However, such products do not have the support, durability, comfort, or style desired in non - foldable shoes.

[0004] Furthermore, foldable shoes according to the prior art do not adequately protect the midsole and upper of the shoe, and thus have an outsole that causes the shoe to wear out quickly (including tearing or damage to the shoe). Additionally, such shoes are generally flimsy, in other words, they do not adequately support or protect the foot. For example, many foldable shoes have an overall spring constant of between 0.14 kilograms per inch and 0.34 kilograms per inch depending on the brand and model. Such shoes provide little or no resistance, protection, and support, and are thus not suitable for repeated or long-term use, particularly on outdoor or rough terrain (e.g., dirty sidewalks, rocks, etc.). Moreover, such shoes do not have sufficient durability to last the lifespan of a typical shoe, even with moderate use. Therefore, while efforts have been made in some footwear designs to bridge the gap between sufficient lifespan and portability of shoes, no practical solution has yet been achieved.

[0005] In the prior art shoe manufacturing process, the outsole is sewn to the midsole. These outsoles are located at the bottom of the shoe, protecting the midsole and upper from wear and tear, and further providing support and rigidity to the entire shoe. After the outsole is sewn, the midsole is sewn to the upper and insole, thereby forming a single seam. This single seam crosses the outer edge of the shoe and substantially delineates the upper of the shoe from the midsole. Such a process is advantageous for manufacturing efficiency, but considering the characteristics of the outsole, the drawbacks of such a method are revealed. The sewing wheel of the sewing machine used to stitch the midsole, upper, and insole interferes with the outsole pre-sewn to the midsole. As a result, a dilemma arises. The ideal outsole patch functions to 1) protect the foot, 2) provide comfort, and 3) provide durability by protecting the seam that secures the midsole, outsole, and insole. Therefore, the ideal outsole patch is thick and wide so that the outer edge of the outsole is close to the seam. However, as the outsole thickens and approaches the seam that secures the upper, midsole, and insole, the seam becomes even more difficult and gradually impossible to stitch. Therefore, prior art shoes are constructed using either (i) an outsole patch that is thin and wide, or (ii) an outsole patch that is narrow and thick. Furthermore, there are limitations in the ability to add a cushion insert below the insole for prior art shoes. This is because the insertion of such a cushion insert makes the handling of the seam more difficult, necessitating the narrowing and thinning of the outsole patch, thereby increasing the instability of the shoe and / or degrading the durability and foot protection of the shoe. Therefore, in prior art shoes, there is a trade-off relationship between the comfort and durability of the shoe with respect to the stability of the shoe. Thus, the dilemma becomes apparent.In the case of a thickened and narrowed outsole, the lack of support due to the gap between the outer edge of the outsole and the seam becomes prominent, impairing the wearing comfort, and the seam, upper, and midsole will be placed in a state of being exposed to the ground. In the case of a thickened and narrowed outsole, the lack of support due to the gap between the outer edge of the outsole and the seam is not so prominent. However, in such a case, the upper, midsole, and seam are exposed to the ground, the outsole will wear out earlier, and the protection and wearing comfort provided by the shoes will be limited.

Summary of the Invention

Problems to be Solved by the Invention

[0006] Considering the above background, an improved foldable shoe design and an improved shoe manufacturing process are needed in the art.

Means for Solving the Problems

[0007] The present disclosure solves the aforementioned drawbacks and other drawbacks related to the prior art by providing an improved foldable shoe. The shoes of the present disclosure are split-sole type women's shoes that are foldable and can be accommodated in a pouch with a drawstring. The split sole is defined by a heel outsole patch and a toe outsole patch (there is a gap between these two patches). In the shoes of the present disclosure, advantageously, the upper and the midsole are combined at the seam, and the insole is added separately. Therefore, the insole is not simultaneously stitched to the seam that joins the midsole and the upper. As a result, (i) the outer edges of the heel outsole patch and the toe outsole patch are closer to the seam that joins the midsole to the upper, and (ii) the outsole patch is thickened, thereby better protecting the seam, midsole, and upper, providing better support and wearing comfort for the foot, making the insole of the shoe harder, and allowing for the insertion of a thicker and more substantial cushion.

[0008] In some embodiments, the outsoles patches are stitched. In some embodiments, the outsoles patches are both stitched and adhered. To assist in stitching the patches, deep grooves are provided near the outer edges of each outsoles patch. These deep grooves are used to form a seam between these patches and the midsole. The thread used to form this seam is better protected due to the deep grooves, thereby improving the durability of the shoe and preventing wear on the seam.

[0009] The shoes of the present disclosure have an improved spring constant compared to known women's split sole type shoes. In some embodiments, the overall spring constant of the shoe is from 0.40 kilogram weight per inch to 0.70 kilogram weight per inch, or from 0.55 kilogram weight per inch to 0.65 kilogram weight per inch. This improved spring constant increases support and allows for an extended wearing period.

[0010] In addition to providing a foam inlay often used in women's shoes in some embodiments, the shoes of the present disclosure insert a cushion insert into the heel portion of the shoe, thereby enabling improvement in support and comfort. Further, this heel portion is thicker at the heel end of the shoe than at a position intermediate between the heel end and the toe end of the shoe. Such a tapered thickness improves comfort, support, and style.

[0011] Although it is well known to place an elastic limiting portion at the edge of the upper that receives a woman's foot, the shoes of the present disclosure provide an improved design by terminating the elastic limiting portion at the heel portion of the shoe. Rather than using an elastic limiting portion, an embedded cushion (Achilles cushion) is provided to make the comfort better.

[0012] Like reference numerals refer to corresponding parts throughout several views. BRIEF DESCRIPTION OF THE DRAWINGS

[0013]

Figure 1

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DETAILED DESCRIPTION OF THE INVENTION

[0014] Figures 1-5 provide perspective, side, top, front, and rear views, respectively, of a shoe according to the present disclosure. From the perspective and side views of Figures 1 and 2, the shoe according to the present disclosure appears to be no different from a conventional hard-soled shoe when worn. However, the shoe according to the present disclosure provides freedom in design, foldability, and comfort without substantially simplifying the wearer's body proportions. In some embodiments, the cushion insert absorbs the impact applied to the foot due to walking on a hard surface. The elastic restraint portion 60 is provided around the top of the upper 2 to grip the foot and fit closely to feet of various dimensions and shapes. On the other hand, the elastic restraint portion 60 is designed not to surround the entire foot by ending in front of the rear portion (if the elastic restraint portion 60 were provided in this portion, the elastic restraint portion 60 would grip the Achilles tendon area, causing discomfort to the wearer). Instead, the Achilles cushion 56 is embedded in the upper fold that would normally surround the elastic restraint portion 60, thereby improving comfort. Further, in some embodiments, the Achilles heel portion of the upper 2 is shaved to reduce its depth. By shaving this portion of the shoe, the seam that would normally protrude and contact the foot is reduced, resulting in improved comfort.

[0015] The elastic limiting part 60 is fixed to the opening of the upper 2 so that the opening of the upper 2 stretches to the foot size when worn. In some embodiments, the elastic limiting part 60 is sewn and adhered to the upper 2 so that these two materials are most securely fixed. In some embodiments, the elastic limiting part 60 is sewn to the upper 2 but not adhered. By sewing the elastic limiting part without adhering, the maximum amount by which the elastic part stretches increases. This enables a comfortable fit at more foot sizes. In addition, by not adhering the elastic part, the natural recovery rate of the elastic limiting part is maintained, resulting in a more excellent wearing comfort and at the same time extending the service life of the elastic part.

[0016] Referring to FIG. 6, the flexible insole 30 provides a more excellent wearing comfort without sacrificing portability and can be fixed or detachable. If desired, the flexible insole 30 supports the arch. The shoe further includes a foam inlay 44 fixed to the insole 30 by an adhesive. In some embodiments, the flexible arch support enhances the wearing comfort without sacrificing portability. The flexible arch support can be fixed or detachable without restricting the folding of the shoe. In some embodiments, the midsole 8 is reinforced by fixing a flexible material inside the midsole and below the insole 30 (for example, between the midsole 8 and the foam inlay 44). The reinforcement of the midsole 8 in such a manner has several advantages. First, the bending point of the footwear is strengthened without sacrificing portability. Second, the part of the midsole 8 that is most likely to be subjected to destructive friction caused by contact with the walking surface is strengthened to better withstand its stress. Third, the part of the midsole 8 that contacts the edge of the toe outsole patch shows a higher resistance to tearing. In some embodiments, such reinforcement is provided as an alternative to the foam inlay 44. In some embodiments, such reinforcement is provided in addition to the foam inlay 44.

[0017] In some embodiments, a rigid insert is inserted between the foam inlay 44 and the midsole 8. This rigid insert extends the width of the midsole 8 from the toe tip of the midsole 8 to an intermediate point 32 where the footwear is folded. By inserting the rigid insert in this way, a greater gap is maintained between the delicate portion of the footwear (e.g., the upper 2) and the walking surface during wear. By increasing this gap, durability is improved.

[0018] Continuing to refer to FIG. 6, the shoe comprises components having three distinct shapes, namely a midsole 8, a heel outsole patch 24, and a toe outsole patch 26. In some embodiments, the midsole 8 is made of a material (such as high-quality leather) that has flexibility while also having durability. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are constructed of a slip-resistant material that can handle all weather conditions. In general embodiments, the heel outsole patch 24 and the toe outsole patch 26 are sewn separately to the midsole 8. The materials required to meet the durability and safety requirements for shoes for constant wear are too hard and thus cannot provide the flexibility required for folding. Accordingly, in a preferred embodiment, the heel outsole patch 24 and the toe outsole patch 26 are separate and are sewn separately to the midsole 8 with a space 32 existing between the heel outsole patch 24 and the toe outsole patch 26 such that the shoe can be folded. The dimensions and shapes of the heel outsole patch 24 and the toe outsole patch 26 are designed such that durability, comfort, and practicality are optimally balanced with compact dimensions and minimal weight. The shapes of the heel outsole patch 24 and the toe outsole patch 26 maximize the protection for the foot in a spatially efficient manner. In some embodiments, the outer contours of the heel outsole patch 24 and the toe outsole patch 26 are sloped such that an additional height is attractively provided when worn and the gap between the midsole 8 and the ground is increased when worn. In such embodiments, the slope is designed such that when two shoes are stacked, the high and low points match up and the combined thickness of the compressed pair is significantly reduced, thereby improving portability.

[0019] The upper 2 of the shoe is made of a high-quality material that has flexibility and durability, and is designed to withstand repeated folding in the central part of the shoe and long-term storage in a folded position. Such materials reduce or eliminate cracks on the surface of the joint and damage caused by contact with the surface. The upper 2 is constructed and sewn to cover and wrap the top and sides of the foot. The specific ratio of the upper and the outsole allows the soft upper 2 to be molded to fit wide and narrow feet, thereby molded to the specific shape of each wearer's foot, and further adds advantages in wearing comfort and style. Such a ratio also reduces the volume of the shoe when in a folded state for storage and portability. The design of the rounded toe cavity 6 and the wrapping upper reduces or eliminates the need for costly half-sizes and / or variable-width inventories, while maintaining a design with durability and comfort, thereby increasing commercial appeal. This design allows for great flexibility with respect to fashion elements through the upper with characteristic colors, textures, decorativeness, etc. When worn, the shoe has an appearance that is not at all different from that of conventional fixed-sole footwear, has an improved style, and can be worn in combination with more formal clothing.

[0020] Referring to FIG. 13, a lightweight, durable, reusable, self-storing tote bag with a handle that can be stored in a compact storage pouch (FIG. 12) after folding and compression further improves the usefulness of the foldable shoe system. In a general embodiment, the pouch is made of a material that can be extended in two directions and can self-fold into a shape with a minimum volume (e.g., a substantially spherical shape). In some embodiments, the stitching of the pouch (e.g., by using zigzag stitching) assists in this extension. In some embodiments, an extensible thread material is used for such stitching.

[0021] Advantageously, the tote bag can be folded within a pocket of the tote bag. In some embodiments, this pocket is on the inside of the tote bag when the tote bag is in an unfolded state. In some embodiments, the pocket is made of an elastic material such that it is compressed when the tote bag is in a folded state. Optionally, the tote bag expands to carry an additional pair of shoes with sufficient volume remaining for additional items. In some embodiments, this pocket is made of a material extensible in two directions and is self - foldable into a shape that minimizes volume (e.g., a generally spherical shape).

[0022] Referring to FIG. 12, a pouch made of stretchable nylon, polyester, or similar material improves functionality by safely and cleanly storing foldable footwear and related items. The pouch compresses the footwear in a folded configuration such that its dimensions are minimized during storage or transport. The rounded edge at the bottom of the pouch reduces volume and increases compression. The pouch has dimensions just slightly smaller than the footwear to minimize volume. The drawstring around the pouch opening further aids compression and shields dirty shoes from a wallet or pocket contents. A pocket located on one side of the pouch allows for compressed storage of the tote bag and / or other items.

[0023] The foldable shoe design of the present disclosure allows for wearing of footwear in a normal manner, which is suitable for various surfaces, weather, fashion, and the like, similar to conventional hard - soled products. When storage or portability is desired, the shoes are manually folded at approximately the mid - point, thereby reducing the length of the shoes by half. In the folded configuration, the shoes can be bundled and placed within a compact storage pouch to maximize compression and portability. When placed within the pouch, a pair of shoes require approximately wallet - sized space and can be carried within a wallet or pocket.

[0024] Although the general outline of the shoes according to the present invention has been disclosed so far, specific features and various embodiments of the shoes of the present disclosure will be described hereinafter. Referring to FIG. 7, shoes according to the present disclosure are shown. The shoe includes an upper 2. The upper 2 forms an inner portion 62 for receiving a woman's foot. The inner portion includes a toe cavity 4 and a heel cavity 6.

[0025] Referring to FIG. 9, the shoe further includes a midsole 8. The midsole 8 includes (i) a toe end portion 10, (ii) a heel end portion 12, (iii) an inner side portion 14, and (iv) an outer side portion 16. The outer side portion of the midsole 8 is sewn to the upper 2. When the midsole 8 is sewn to the upper 2, a bottom is thereby formed for the inner portion 62 surrounded by the first seam 22. A heel outsole patch 24 is sewn to the heel portion of the first surface of the midsole 8. A toe outsole patch 26 is sewn to the toe portion of the first surface of the midsole 8.

[0026] In a general embodiment, the heel outsole patch 24 and the toe outsole patch 26 are sewn to the midsole before the midsole 8 is sewn to the upper 2.

[0027] Referring to FIG. 6, there is a gap 32 between (i) a heel outsole patch 24 stitched to the heel portion of the first surface of the midsole 8 and (ii) a toe outsole patch 26 stitched to the toe portion of the first surface of the midsole 8. The gap 32 extends from the inner side portion 14 to the outer side portion 16 of the midsole 8 and occupies a position intermediate the toe end 10 and the heel end 12 of the midsole 8, whereby the entire shoe can be folded about an axis 34 in the gap 32 that extends between the inner side portion 14 and the outer side portion 16. In some embodiments, this gap is 4 / 8 inch to 6 / 8 inch. In some embodiments, this gap is about 5 / 8 inch. To determine these measurements, it is advisable to determine the “average” distance between the heel outsole patch 24 and the toe outsole patch 26 in the region bounded by the inner side portion 14 and the outer side portion 16. For example, at several different points in the region bounded by the inner side portion 14 and the outer side portion 16, measure the distance between the edge of the heel outsole patch 24 and the edge of the toe outsole patch 26, and determine the average value of these measurements, thereby determining the distance between the heel outsole patch 24 and the toe outsole patch 26. In some embodiments, these gaps are simply the breaks between the heel outsole patch 24 and the toe outsole patch 26.

[0028] Continuing with reference to FIG. 6, the insole 30 is fixed to the bottom of the inner portion by an adhesive.

[0029] The shoe is configured to be folded between (i) an extended state (FIGS. 1-9) in which the heel outsole patch 24 and the toe outsole patch 26 are in the same plane or substantially in the same plane, and (ii) a folded state (FIG. 11) in which the shoe is bent about an axis 34 such that the portion of the upper 2 including the toe cavity 4 is pushed into the heel cavity 6.

[0030] In some embodiments, the insole 30 is not stitched to the upper 2. Thus, in such embodiments, the first seam 22 shown in FIG. 9 joins the upper 2 and the midsole 8 but not the insole 30. Referring to FIG. 9, this provides substantial advantages. The reason is that the outer edges (rims) of the heel outsole patch 24 and the toe outsole patch 26 can be closer to the first seam 22 than when the first seam integrates the upper 2, the midsole 8, and the insole 30, enabling thickening of the heel outsole patch and the toe outsole patch and hardening of the cushioning in the insole (e.g., thickening and hardening). This distance is illustrated as distance 104 in FIG. 9A. Thus, in embodiments where the first seam 22 joins only the upper 2 and the midsole 8, the edge of the rear corner 64 of the toe outsole patch 26 is within 1 / 4 inch of a portion of the first seam 22. The thickness of the outsole patch and the proximity to the seam 22 advantageously function to protect the area of the midsole 8 at the interval 32 from wear and tear. In some embodiments, the edge of the front corner 66 of the toe outsole patch 26 is within 1 / 4 inch of a portion of the first seam 22.

[0031] In a general embodiment, the distance 104 between the edge of the toe outsole port 26 and the first seam 22 is uniform. In some embodiments where this distance 104 is uniform, the edges of (i) the rear corner 64 and (ii) the front corner 66 of the toe outsole patch 26 are within 4 / 8 inch, 3 / 8 inch, or 2 / 8 inch of the corresponding portions of the first seam 22, respectively.

[0032] In some embodiments, the edge of the rear corner 68 of the heel outsole patch 24 is within 3 / 16 inch of a portion of the first seam 22. In some embodiments, the edge of the front corner 70 of the heel outsole patch 24 is within 2 / 4 inch to 3 / 4 inch of a portion of the first seam 22. In some embodiments, the distance 104 between the edge of the heel outsole port 24 and the first seam 22 is uniform. In some embodiments where this distance 104 is uniform, the edges of (i) the rear corner 68 and (ii) the front corner 70 of the heel outsole patch 24 are within 4 / 8 inch, 3 / 8 inch, or 2 / 8 inch of the corresponding portions of the first seam 22, respectively. In some embodiments, the distance 104 between the edge of the heel outsole port 24 and the first seam 22 is not uniform. In some embodiments where this distance 104 is not uniform, the edge of the rear corner 68 of the heel outsole patch 26 is within 3 / 8 inch or 2 / 8 inch of the corresponding portion of the first seam 22.

[0033] Such a close distance 104, combined with the rubber thickness and cushion firmness enabled by the described assembly method, aids in protecting the midsole 8 and upper 2. Thereby, the durability of the shoe is ensured while allowing for a foldable design that retains flexibility and comfort.

[0034] Referring to FIG. 9A, an unparalleled improved feature of this shoe is the value of the durability coefficient. As used herein, the term "durability coefficient" is defined as the value obtained by dividing the thickness 106 of the outsole patch by the distance 104 between the edge of the outsole patch and the first seam 22. In some embodiments, the distance 104 is 4 mm and the thickness 106 is also 4 mm, so the durability coefficient is 1. In some embodiments, the distance 104 is 4 mm and the thickness 106 is 5 mm, so the durability coefficient is 1.25. In some embodiments, the durability coefficient is between 0.8 and 1.5. In some embodiments, the durability coefficient is between 0.9 and 1.4. In some embodiments, the durability coefficient is between 1.0 and 1.3.

[0035] In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are advantageously each at least 3 / 32 inches thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are advantageously each at least 4 / 32 inches thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are advantageously each at least 5 / 32 inches thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are advantageously each at least 6 / 32 inches thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each at least 7 / 32 inches thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each at least 8 / 32 inches thick. These thicknesses increase the spring constant of the sole, thereby enhancing the support for the foot and improving the durability of the shoe. Referring to FIG. 1, due to the thickness of the outsole patch and its proximity to the edge of the outsole patch, when a woman stands upright relative to the horizontal plane and the shoe is worn on the woman's foot, the side of the outsole patch is visible at an angle 100 of at least 45 degrees from the horizontal plane 102. In some embodiments, when a woman stands upright relative to the horizontal plane and the shoe is worn on the woman's foot, the side of the outsole patch is visible at an angle 100 of at least 50 degrees, at least 55 degrees, or at least 60 degrees from the horizontal plane 102. This visibility of the outsole patch is described herein merely to illustrate the dimensions and shape of the shoes disclosed herein.

[0036] In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are made of an elastomer. Representative elastomers that may be used include, but are not limited to, natural rubber, vulcanized natural rubber, butadiene-styrene copolymers such as GR-S, neoprene, nitrile rubber, butyl, polysulfide rubber, ethylene-propylene rubber, polyurethane rubber, and silicone rubber, as described in Marks’ Standard Handbook for Mechanical Engineers, 1987, Avallone and Baumeister, eds., McGraw-Hill, New York, pp. 6-161 through 1-163. The same document is hereby incorporated by reference herein. In some embodiments, the midsole 8 is made of leather.

[0037] Referring to FIGS. 6, 6A, and 6B, in some embodiments, the shoe is characterized by a midsole 8. A heel outsole patch 24 and a toe outsole patch 26 are stitched onto a first surface of the midsole 8. The midsole 8 comprises a second surface having a heel portion 68 and a toe portion 70. In some embodiments, a cushion insert 46 is adhered to the heel portion 68 of the second surface of the midsole 8. The insert 46 absorbs the impact applied to the foot when walking on a hard surface. The insert 46 adapts to the shape of the foot over time. A foam inlay 44 is adhered to (i) the cushion insert 46 and (ii) the toe portion 70 of the second surface of the midsole 8. Next, an insole 30 is secured to the foam inlay 44 by an adhesive. The cushion insert 46 is characterized by a first end 76 and a second end 78. The first end 76 of the cushion insert 46 is adhered to a first portion 72 of the heel portion 68, and the second end 78 of the cushion insert 46 is adhered to a second portion 74 of the heel portion 68. The first portion 72 of the heel portion 68 is closer to the toe portion 70 of the second surface of the midsole 8 than is the second portion 74 of the heel portion 68. In some embodiments, the thickness of the first end 76 of the cushion insert 46 is less than the thickness of the second end 78 of the cushion insert 46. In some embodiments, the cushion insert 46 thickens along the cushion insert 46 as a function of the distance from the toe portion 70 of the midsole 8 such that the thickness of the portion of the cushion insert closest to the toe portion 70 of the midsole is less than the thickness of the portion of the cushion insert 46 furthest from the toe portion 70 of the midsole 8. In some embodiments, the maximum thickness of the cushion insert 46 is 3 millimeters or more, 4 millimeters or more, 5 millimeters or more, 6 millimeters or more, 7 millimeters or more, or 8 millimeters or more. This advantageously functions to improve the support provided by the shoe, particularly at the heel, provides a desirable lift, increases stiffness, and thereby improves durability.

[0038] In addition to gradually increasing in thickness to improve foot support, the cushion insert 46 is made of a rigid material (such as rigid ethylene vinyl acetate or a similar cushioning material). In some embodiments, the cushion insert 46 has a Shore A hardness of 45-70 or 60-70. In some embodiments, the cushion insert 46 has a density of 0.30 g / cm 3 ~0.5 g / cm 3 、0.40 g / cm 3 ~0.5 g / cm 3 、0.45 g / cm 3 ~0.5 g / cm 3 、or 0.50 g / cm 3 ~0.70 g / cm 3 .

[0039] The thickness of the heel outsole patch 24 and the toe outsole patch 26, the materials used to make these patches, their proximity to the seam 22 of these patches, and the ability to add a cushion insert all contribute significantly to improving the spring constant for a known foldable shoe. In some embodiments, the overall spring constant of the shoe measured longitudinally in the heel portion 68 of the shoe (i.e., the region of the heel outsole patch 24) is 0.40 kilogram-force per inch to 0.70 kilogram-force per inch. In some embodiments, the overall spring constant of the shoe measured longitudinally in the heel portion 68 of the shoe is 0.45 kilogram-force per inch to 0.65 kilogram-force per inch, or 0.55 kilogram-force per inch to 0.65 kilogram-force per inch. In some embodiments, the overall spring constant of the shoe measured longitudinally in the heel portion 68 of the shoe is approximately 0.6 kilogram-force per inch. Referring to FIG. 6, in achieving such spring constant measurements, portions 68 and 70 are measured separately. For each region, with the shoe in an upright position, one end (i.e., one end of portion 68 or portion 70 that extends longitudinally and is upward when the shoe is worn) is fixed, and subsequently, the other end of the portion 68 or portion 70 of the shoe to be measured is pushed down by a fixed distance (e.g., 1 inch), and then the force applied by the pushed-down end is measured.

[0040] In some embodiments, the overall spring constant of the shoe, measured longitudinally in the toe portion 70 of the shoe (i.e., the region of the toe outsole patch 26), is from 0.40 kilogram weight per inch to 0.70 kilogram weight per inch. In some embodiments, the overall spring constant of the shoe, measured longitudinally in the toe portion 70 of the shoe, is from 0.45 kilogram weight per inch to 0.65 kilogram weight per inch, or from 0.55 kilogram weight per inch to 0.65 kilogram weight per inch. In some embodiments, the overall spring constant of the shoe, measured longitudinally in the toe portion 68 of the shoe, is about 0.6 kilogram weight per inch.

[0041] Other advantageous features of the shoe according to some embodiments of the present disclosure are the deep grooves of the heel outsole patch 24 and the toe outsole patch 26 that protect the stitching while assisting in stitching the patch to the midsole 8. The deep groove 48 is made possible by an advantageous design in which the thickened outsole patch is used and the outsole patch is close to the first seam 22 that secures the upper 2 to the midsole 8. The deep groove 48 protects the stitching that secures the outsole patch to the midsole 9 from contact with the ground (such contact would wear the stitching and thereby cause the outsole patch to separate). These advantageous features will be described. By stitching only the upper 2 to the midsole 8 to form the first seam rather than further stitching the insole 30 to the midsole 8, it is still possible to stitch the midsole 8 to the upper 2 using a conventional process such as a sewing machine, while minimizing the distance 104 and thickening the outsole patches 24 / 26. Minimizing the distance 104 allows for thickening of the outsole patches 24 / 26 (i.e., increasing the distance 106) without destabilizing the support of the foot. Thickening the outsole patches 24 / 26 allows for an increase in the depth of the first groove 48, resulting in better protection of the stitching within the groove. Further, thickening the outsole patch causes the shoe to be hardened, enabling longer-term use and use over a wider range of terrains (e.g., on asphalt, concrete, dirty road surfaces, etc.). Referring to FIG. 9, one such advantageous embodiment has a first groove 48 having a depth of at least 3 / 64 inches and formed adjacent to the outer edge of the heel outsole patch 24. The heel outsole patch 24 is stitched to the heel portion of the first surface of the midsole 8 using a first thread that occupies the first groove 48. Further, a second groove 50 having a depth of at least 3 / 64 inches is formed adjacent to the outer edge of the toe outsole patch 26. The toe outsole patch 26 is stitched to the toe portion of the first surface of the midsole 8 using a second thread that occupies the second groove 50. In some embodiments, the first groove 48 is about 3 / 32 inches.In some embodiments, the second groove 50 is about 3 / 32 inches.

[0042] Referring to FIG. 5, the upper 2 is integrally formed with a first end and a second end. The first end and the second end are integrated by a second seam 52 in the heel cavity. In some embodiments, the upper 2 is formed from two or more pieces.

[0043] Referring to FIGS. 3 and 9, in a general embodiment, the upper 2 is integrally formed with (i) a first end (80), (ii) a second end (82), (iii) a first edge (84) (seen in FIG. 9), and (iv) a second edge (86). In some embodiments, the upper 2 is formed from two or more stitched pieces. Referring to FIG. 3, in a general embodiment, the upper 2 is integral with ends 110A and 110B. Of course, the upper 2 can be formed by any number of pieces stitched to an integral having ends 110A and 110B. Regardless of whether the upper is made as a single piece or from multiple pieces, the end 110A (first end) and the end 110B (second end) are integrated by a second seam 52 in the heel cavity 6, resulting in the completion of the upper 2. Referring back to FIG. 9, the first edge 84 of the upper 2 is stitched to the outer side of the midsole 8, thereby forming the second seam 22 and the bottom with respect to the inner portion of the shoe. Referring back to FIG. 3, the first portion of the second edge 86 is characterized by an elastic limit 60, and the first portion of the second edge does not extend to the heel cavity 6. In some embodiments, the second portion of the second edge 86 is characterized by an Achilles cushion 56 that provides an upper boundary with respect to the heel cavity 6. Further, referring to FIG. 5, in some embodiments, the semi-circular piece 58 covers the lower portion of the second seam 52, while the strip portion 54 covers the upper portion of the second seam 52.

[0044] Referring to FIG. 11, in some embodiments, the shoe is in a folded state. In this folded state, the shoe can be pushed into a compact storage pouch (FIG. 12) made of stretchable nylon or similar material having a drawstring. This provides for the advantageous transport of the shoe in a clean and compact state while being compressed to its minimum dimensions. In some embodiments, the pouch includes a pocket for holding a tote bag. The tote bag is configured to accommodate a pair of women's shoes or other items and personal belongings. Thereby, while carrying the shoes of the present disclosure in the pouch on the road, taking the shoes of the present disclosure out of the pocket of the pouch, expanding from the folded form, and then storing the previously worn and unwanted shoes in the tote bag, it is possible to switch to wearing the shoes of the present disclosure.

[0045] The shoes of the present disclosure can advantageously be pushed into a folded state so as to be stored in a compact box having a lid. Such a compact box is shown in FIG. 10.

[0046] In some embodiments, the edges of the outsoles patches are chamfered in two ways. First, the outer edges of the outsoles patches are chamfered with a steep gradient for durability and aesthetic reasons. By maintaining the steep chamfer on the outer edges of the outsoles patches, a greater gap is maintained between the walking surface and the flexible elements of the footwear, thereby improving durability. Second, in some embodiments, the inner edges of one or more outsoles patches are chamfered. By chamfering the outsoles patches in this way, the pressure between the edges of the outsoles patches and the more flexible midsole is reduced. This chamfering process bluntens and softens the edges of the outsoles patches that are not fixed to the midsole. By softening these edges, the durability and long life of the footwear are improved.

[0047] As described above, the split sole footwear according to the prior art has certain limitations. In some embodiments, the drawbacks of the prior art are overcome by providing shoes that achieve a maximum outsole ratio (OR). The OR is defined as follows. OR = (D × T × W) / M In the above formula, D = the average depth of the second groove 50, T = the average thickness of the toe outsole patch 26, W = the maximum width of the toe outsole patch 26, M = the width of the midsole 8 at the point of the maximum width of the toe outsole patch 26. However, W is smaller than M, and D, T, W, and M are all given in the same unit of length (e.g., millimeters). Therefore, in some embodiments, the shoes of the present disclosure have an outsole ratio OR. When this ratio is maximized, the toe outsole patch 26 is thickened, the depth of the second groove 50 where the stitching of the toe outsole patch 26 is made is increased, and the toe outsole patch 26 is in a state close to the edge of the footwear. In some embodiments, an acceptable outsole ratio requires a toe outsole patch 26 that is as narrow as possible while still accommodating a wide range of foot widths. The narrower the toe outsole patch 26, the more compact and portable the footwear will be and the better it will accommodate narrow feet. The thickened toe outsole patch 26 is important for foot safety and comfort when walking on an uneven surface.

[0048] Furthermore, as the toe outsole patch 26 is narrowed in width, the seam area will receive greater contact with the walking surface, making the depth of the second groove 50 for stitching more important. Thus, a deep groove 50 is required to protect the stitching of the seam. The proximity of the toe outsole patch 26 to the midsole 8 covered by the toe outsole patch 26 and the edge of the upper 2 also increases in importance as the toe outsole patch 26 is narrowed in width. The advantages of the toe outsole patch 26 in proximity to the edge of the footwear have also been presented above. In view of the present disclosure, it will be apparent that these same principles apply to the heel outsole patch 24 and the first groove 48.

[0049] Table 1 below shows suitable values for the average depth (D) of the second groove 50, the average thickness (T) of the toe outsole patch 26, the maximum width (W) of the toe outsole patch 26, and the width (M) of the midsole 8 at the point of the maximum width of the toe outsole patch 26, according to an embodiment of the present disclosure. [Table 1]

[0050] In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.0 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.2 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.4 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.6 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.8 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 8.0 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 8.2 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 8.4 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 8.6 or greater. Achieving an outsole ratio of this magnitude provides several advantages that enhance the potential of split sole footwear.

[0051] The following Table 2 and Table 3 show suitable values for the average depth (D) of the second groove portion 50, the average thickness (T) of the toe outsole patch 26, the maximum width (W) of the toe outsole patch 26, and the width (M) of the midsole 8 at the point of the maximum width of the toe outsole patch 26 according to embodiments of the present disclosure. [Table 2] [Table 3]

[0052] In some embodiments, shoes are provided that achieve a maximum outsole ratio (OR). The OR is defined as follows. OR’=(D’×T’×W’) / M’ In the above formula, D’ is the average depth of the second groove portion 50, which is a value of 2.0 mm to 3.0 mm. T’ is the average thickness of the toe outsole patch 26, which is a value of at least 3.0 mm. W’ is the maximum width of the toe outsole patch 26, which is a value of 60 mm to 89 mm. M’ is the width of the midsole 8 at the point of the maximum width of the toe outsole patch 26, which has a value greater than W’ and is a value of 70 mm to 93 mm. OR’ is a value of 7.0 to 8.6. In some embodiments, T’ has a value of at least 4.0 mm, at least 5.0 mm, at least 6.0 mm, at least 7.0 mm, at least 8.0 mm, or at least 9.0 mm.

[0053] The first advantage of the shoe that satisfies this OR measurement value is the improvement of the wearing comfort. A thicker outsole patch enables a greater cushion between the foot and the walking surface, minimizing the impact of hard objects. A wide outsole patch close to the edge of the shoe covers a larger area of the bottom of the foot, thereby eliminating the discomfort of applying pressure to the edge of the outsole, or worse, the discomfort of the rubber edge hanging down, which the foot no longer feels.

[0054] The second advantage is the improvement of foot protection. The thickened outsole provides a better barrier, thereby protecting the foot better against hard or sharp objects. Additionally, a wider outsole better protects and covers the foot.

[0055] The third advantage is the improvement of durability. The outsole close to the edge of the shoe protects the seam stitching, the outsoles (24 and 26), the midsole (8), and other delicate components of the shoe. The thickened outsoles (24 and 26) provide more outsole for wear before the delicate components of the shoe (such as the midsole 8) wear due to contact with the ground. Deeper grooves (e.g., the first groove 48 and the second groove 50) better protect the outsole seam stitching, so the wear of the outsole seam stitching is not as rapid.

[0056] The fourth advantage is that a more attractive style is made possible. That is, the narrow shoe stretches and can adapt to a wider foot when needed. This is achieved by deep grooves (e.g., the first groove 48 and the second groove 50). Note that this deep groove protects the stitching from the large contact between the groove (and thus the stitching within the groove) on the narrower shoe and the ground. This is further achieved by thickened outsole patches (e.g., the heel outsole patch 24 and the toe outsole patch 26) proximate to the edges. Note that this proximity to the edges is of higher importance in a narrow shoe since some feet are wider than the outsole. Here, the thickness of the outsole prevents a wider foot from pushing the seam / midsoles 8 / upper 2 down to the ground.

[0057] The fifth advantage is that the portability of the shoe is enhanced and the shoe becomes more compact because the area of the non - foldable heel outsole patch 24 and the toe outsole patch is minimized.

[0058] Exemplary Embodiments The following are non - limiting exemplary embodiments of the present disclosure.

[0059] Embodiment A An upper forming an inner portion for receiving a human foot, the inner portion comprising a toe cavity and a heel cavity, A midsole having (i) a toe end, (ii) a heel end, (iii) an inner side portion, and (iv) an outer side portion, the outer perimeter of the midsole being stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, the midsole, A heel outsole patch stitched to the heel portion of the first surface of the midsole, A toe outsole patch stitched to the toe portion of the first surface of the midsole, An insole fixed to the bottom of the inner portion by an adhesive, A shoe comprising (i) The heel outsole patch stitched to the heel portion of the first surface of the midsole, and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, have a gap therebetween, and the gap extends from the inner side portion to the outer side portion and occupies a position intermediate between the toe end portion and the heel end portion, whereby the whole shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion, The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity, (i) The insole is not stitched to the upper or the midsole, (ii) The heel outsole patch and the toe outsole patch are each made of an elastomer, Shoe.

[0060] Embodiment B An upper forming an inner portion for receiving a human foot and having a toe cavity and a heel cavity, (i) A midsole having a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, wherein an outer peripheral portion of the midsole is stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, A heel outsole patch stitched to the heel portion of the first surface of the midsole, A toe outsole patch stitched to the toe portion of the first surface of the midsole, An insole fixed to the bottom of the inner portion by an adhesive, A shoe comprising: (i) The heel outsole patch stitched to the heel portion of the first surface of the midsole, and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, have a gap therebetween, and the gap extends from the inner side portion to the outer side portion and occupies a position intermediate between the toe end portion and the heel end portion, whereby the whole shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion, The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity, (i) The insole is not stitched to the upper, (ii) The region of the shoe defined by the heel outsole patch and having corresponding portions of the midsole and the insole has a spring constant of 0.40 kilogram weight per inch to 0.70 kilogram weight per inch, A shoe.

[0061] Embodiment C An upper forming an inner portion for receiving a human foot and having a toe cavity and a heel cavity, (i) A midsole having a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, wherein an outer side portion of the midsole is stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, the midsole, A heel outsole patch stitched to the heel portion of the first surface of the midsole, A toe outsole patch stitched to the toe portion of the first surface of the midsole, An insole fixed to the bottom of the inner portion by an adhesive, A shoe comprising, (i) The heel outsole patch stitched to the heel portion of the first surface of the midsole, and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, there is a gap between them, the gap extends from the inner side portion to the outer side portion, occupies a position intermediate between the toe end portion and the heel end portion, whereby the whole shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion, The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are on the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. (i) The insole is not stitched to the upper, (ii) The rear corner of the toe outsole patch is within 1 / 4 inch of a part of the first seam. Shoe.

[0062] Embodiment D An upper forming an inner portion for receiving a human foot, the inner portion having a toe cavity and a heel cavity, (i) A midsole having a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, the outer peripheral portion of the midsole is stitched to the upper, whereby a bottom for the inner portion surrounded by a first seam is formed, the midsole, A heel outsole patch stitched to the heel portion of the first surface of the midsole, A toe outsole patch stitched to the toe portion of the first surface of the midsole, An insole fixed to the bottom of the inner portion by an adhesive, A shoe comprising: (i) The heel outsole patch stitched to the heel portion of the first surface of the midsole, and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, have a gap therebetween, the gap extending from the inner side portion to the outer side portion and occupying a position intermediate the toe end portion and the heel end portion, whereby the entire shoe is foldable about an axis in the gap extending between the inner side portion and the outer side portion, The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity, (i) The insole is not stitched to the upper, (ii) A first groove portion having a depth of at least 3 / 64 inch is formed adjacent to the outer edge portion of the heel outsole patch, and the heel outsole patch is stitched to the heel portion of the first surface of the midsole using a first thread occupying the first groove portion, (iii) A second groove portion having a depth of at least 3 / 64 inch is formed adjacent to the outer edge portion of the toe outsole patch, and the toe outsole patch is stitched to the toe portion of the first surface of the midsole using a second thread occupying the second groove portion, Shoe.

[0063] Embodiment E An upper forming an inner portion for receiving a human foot, the inner portion including a toe cavity and a heel cavity, (i) A midsole having a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, the outer edge portion of the midsole being stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, the midsole, A heel outsole patch stitched to the heel portion of the first surface of the midsole, A toe outsole patch stitched to the tip portion of the first surface of the midsole, An insole fixed to the bottom of the inner portion with an adhesive, A shoe comprising: (i) A heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) a toe outsole patch stitched to the toe portion of the first surface of the midsole, with a gap therebetween, the gap extending from the inner side portion to the outer side portion and occupying a position intermediate the toe end and the heel end, whereby the entire shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion, The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane and (ii) a folded state in which the shoe is bent about the axis such that a portion of the upper including the toe cavity is pushed into the heel cavity, (i) A region of the shoe defined by the heel outsole patch and including corresponding portions of the midsole and the insole has a spring constant of 0.45 kgf / inch to 0.55 kgf / inch, (ii) The toe outsole patch or the heel outsole patch has a durability coefficient of 0.8 to 1.5, A shoe.

[0064] Embodiment F A method of manufacturing a shoe, comprising: (A) Stitching a heel outsole patch to the heel portion of the first surface of a midsole, (B) Stitching a toe outsole patch to the toe portion of the first surface of the midsole, (C) Fixing a cushion insert to the heel portion of the second surface of the midsole, (D) An upper forming an inner portion for receiving a human foot and having a toe cavity and a heel cavity is sewn to the midsole having a (i) toe end, (ii) heel end, (iii) inner side portion, and (iv) outer side portion, wherein by sewing (D), the outer edge portion of the midsole is sewn to the upper, thereby forming a bottom for the inner portion surrounded by a first seam. (E) Fixing an insole to the bottom of the inner portion with an adhesive. (including) The sewing (A) and the sewing (B) form a space between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole, the space extending from the inner side portion to the outer side portion and occupying a position intermediate the toe end and the heel end, whereby the entire shoe is foldable about an axis in the space extending between the inner side portion and the outer side portion. The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. (i) The insole is not sewn to the upper or the midsole. (ii) The heel outsole patch and the toe outsole patch are each made of an elastomer. (Method)

[0065] (Embodiment G) (A method of manufacturing a shoe, comprising) (A) Sewing a heel outsole patch to the heel portion of the first surface of a midsole. (B) Stitching a toe outsole patch to the toe tip portion of the first surface of the midsole; (C) Stitching an upper that forms an inner portion for receiving a human foot and includes a toe cavity and a heel cavity to the midsole having (i) a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, wherein by the stitching (C), the outer edge portion of the midsole is stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam; (D) Fixing an insole to the bottom of the inner portion with an adhesive; comprising; The stitching (A) and the stitching (B) form a gap between (i) the heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) the toe outsole patch stitched to the toe tip portion of the first surface of the midsole, the gap extending from the inner side portion to the outer side portion and occupying a position intermediate the toe end portion and the heel end portion, whereby the entire shoe is foldable about an axis in the gap extending between the inner side portion and the outer side portion; The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane and (ii) a folded state in which the shoe is bent about the axis such that a portion of the upper including the toe cavity is pushed into the heel cavity; (i) The region of the shoe defined by the heel outsole patch and including corresponding portions of the midsole and the insole has a spring constant of 0.45 kgf / inch to 0.55 kgf / inch; (ii) The toe outsole patch or the heel outsole patch has a durability coefficient of 0.8 to 1.5; Method.

[0066] Embodiment H-1 Any one of Embodiments A, B, C, D, E, F, and G, wherein the midsole is made of leather.

[0067] Embodiment H-2 Any one of Embodiments A, B, C, D, E, F, and G, wherein the bottom of the inner part further comprises a foam inlay, and the insole is fixed to the foam inlay by an adhesive.

[0068] Embodiment H-3 Any one of Embodiments A, B, C, D, E, F, and G, wherein the inner part further comprises a cushion insert adhered to the heel part of the second surface of the midsole.

[0069] Embodiment H-4 The midsole comprises a second surface having a heel part and a toe part, The inner part further comprises a cushion insert adhered to the heel part of the second surface of the midsole The foam inlay is adhered to (i) the cushion insert and (ii) the toe part of the second surface of the midsole. Embodiment of H-2.

[0070] Embodiment H-5 The cushion insert is characterized by a first end and a second end, The first end of the cushion insert is adhered to a first part of the heel part, the second end of the cushion insert is adhered to a second part of the heel part, and the first part of the heel part is closer to the toe part of the second surface of the midsole than the second part of the heel part. The first end of the cushion insert is thinner than the second end of the cushion insert. Embodiment of H-3.

[0071] Embodiment H-6 In the H-3 embodiment, the cushion insert is thickened along the insert as a function of the distance from the toe portion of the second surface of the midsole such that the portion of the cushion insert closest to the toe portion of the midsole is thinner than the portion of the cushion insert farthest from the toe portion of the midsole.

[0072] Embodiment H-7 In the H-3 embodiment, the cushion insert comprises a material of ethylene vinyl acetate type or polyurethane type.

[0073] Embodiment H-8 In the H-3 embodiment, the cushion insert has a Shore A hardness of 45 to 70 or 60 to 70.

[0074] Embodiment H-9 The cushion insert is 0.30 g / cm 3 ~0.7 g / cm 3 In the H-3 embodiment, it has a density of.

[0075] Embodiment H-10 The cushion insert is 0.40 g / cm 3 ~0.7 g / cm 3 In the H-3 embodiment, it has a density of.

[0076] Embodiment H-11 A first groove having a depth of at least 3 / 64 inch is formed adjacent to the outer side of the heel outsole patch, and the heel outsole patch is stitched to the heel portion of the first surface of the midsole using a first thread occupying the first groove. A second groove having a depth of at least 3 / 64 inch is formed adjacent to the outer side of the toe outsole patch, and the toe outsole patch is stitched to the toe portion of the first surface of the midsole using a second thread occupying the second groove. Any one of Embodiments A, B, C, D, E, F, and G.

[0077] Embodiment H-12 Any one of Embodiments A, B, C, D, E, F, and G, wherein the upper is integrally formed with a first end portion and a second end portion, and the first end portion and the second end portion are integrated by a second seam in the heel cavity.

[0078] Embodiment H-13 The upper is integrally formed with (i) a first end portion, (ii) a second end portion, (iii) a first edge portion, and (iv) a second edge portion. The first end portion and the second end portion are integrated by a second seam in the heel cavity. The first edge portion is stitched to the outer side portion of the midsole, thereby forming the bottom with respect to the inner portion. A first portion of the second edge portion is characterized by an elastic limiting portion, and the first portion of the second edge portion does not extend to the heel cavity. Any one of Embodiments A, B, C, D, E, F, and G.

[0079] Embodiment H-14 Any one of Embodiments A, B, C, D, E, F, and G, wherein a second portion of the second edge portion is characterized by an Achilles cushion that provides an upper boundary with respect to the heel cavity.

[0080] Embodiment H-15 The upper is integrally formed with a first end portion and a second end portion. The first end portion and the second end portion are integrated by a second seam in the heel cavity. A semi-circular piece covers a lower portion of the second seam. Any one of Embodiments A, B, C, D, E, F, and G.

[0081] Embodiment H-16 Any one of Embodiments A, B, C, D, E, F, and G, wherein the shoe is in a folded state and is pushed into a pouch having a pull string.

[0082] Embodiment H-17 The pouch includes a pocket for holding a tote bag, and the tote bag is configured to accommodate a pair of shoes, which is Embodiment H-16.

[0083] Embodiment H-18 The shoes are in a folded state and are pushed into a compact box having a lid, which is any one of Embodiments A, B, C, D, E, F, and G.

[0084] Embodiment H-19 The rear corner of the toe outsole patch is within 1 / 4 inch of a portion of the first seam, which is any one of Embodiments A, B, C, D, E, F, and G.

[0085] Embodiment H-20 The rear corner of the toe outsole patch is within 3 / 16 inch of a portion of the first seam, which is any one of Embodiments A, B, C, D, E, F, and G.

[0086] Embodiment H-21 The front corner of the toe outsole patch is within 1 / 4 inch of a portion of the first seam, which is any one of Embodiments A, B, C, D, E, F, and G.

[0087] Embodiment H-22 The rear corner of the heel outsole patch is within 3 / 16 inch of a portion of the first seam, which is any one of Embodiments A, B, C, D, E, F, and G.

[0088] Embodiment H-23 The rear corner of the heel outsole patch is within 1 / 4 inch of a portion of the first seam, which is any one of Embodiments A, B, C, D, E, F, and G.

[0089] Embodiment H-24 Any one of Embodiments A, B, C, D, E, F, and G, wherein the toe outsole patch or the heel outsole patch has a durability coefficient of 0.8 to 1.5.

[0090] Embodiment H-25 Any one of Embodiments A, B, C, D, E, F, and G, wherein the toe outsole patch or the heel outsole patch has a durability coefficient of 1.0 to 1.3.

[0091] Embodiment H-26 Any one of Embodiments A, B, C, D, E, F, and G, wherein the heel outsole patch and the toe outsole patch each have a thickness of at least 3 / 32 inch.

[0092] Embodiment H-27 Any one of Embodiments A, B, C, D, E, F, and G, wherein the heel outsole patch and the toe outsole patch each have a thickness of approximately 5 / 32 inch.

[0093] Embodiment H-28 Any one of Embodiments A, B, C, D, E, F, and G, wherein the interval is 4 / 8 inch to 6 / 8 inch.

[0094] Embodiment H-29 Any one of Embodiments A, B, C, D, E, F, and G, wherein the interval is approximately 5 / 8 inch.

[0095] Embodiment H-30 Any one of Embodiments A, B, C, D, E, F, and G, wherein when the shoe is worn on the foot of a person standing on a horizontal plane, the side portion of the heel outsole patch is visible at an angle of at least 45 degrees from the horizontal plane.

[0096] Embodiment H-31 When the shoe is worn on the foot of a person standing on a horizontal plane, the side portion of the toe outsole patch is visible at an angle of at least 45 degrees from the horizontal plane, any one of Embodiments A, B, C, D, E, F, and G.

[0097] Embodiment H-32 The area of the shoe defined by the heel outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.40 kilogram-force per inch to 0.70 kilogram-force per inch, any one of Embodiments A, B, C, D, E, F, and G.

[0098] Embodiment H-33 The area of the shoe defined by the heel outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.45 kilogram-force per inch to 0.55 kilogram-force per inch, any one of Embodiments A, B, C, D, E, F, and G.

[0099] Embodiment H-34 The area of the shoe defined by the toe outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.40 kilogram-force per inch to 0.70 kilogram-force per inch, any one of Embodiments A, B, C, D, E, F, and G.

[0100] Embodiment H-35 The area of the shoe defined by the toe outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.45 kilogram-force per inch to 0.55 kilogram-force per inch, any one of Embodiments A, B, C, D, E, F, and G.

[0101] Embodiment H-36 The shoe is a women's shoe, any one of Embodiments A, B, C, D, E, F, and G.

[0102] Embodiment H-37 The shoe is any one of embodiments A, B, C, D, E, F, and G, which is a men's shoe.

[0103] Embodiment H-38 The shoe is any one of embodiments A, B, C, D, E, F, and G, which is a men's shoe, a women's shoe, or a children's shoe.

[0104] Cited References and Alternative Embodiments All cited references in this specification are hereby incorporated by reference in their entirety for all purposes to the same extent as if each respective publication, patent, or patent application had been specifically and individually indicated to be incorporated by reference in its entirety for all purposes.

[0105] As will be apparent to those skilled in the art, numerous modifications and variations are possible without departing from the spirit and scope of the invention. The specific embodiments described herein are provided by way of example only. These embodiments illustrate the principles of the invention and its practical applications in the best mode, thereby enabling other skilled artisans to utilize the invention and various embodiments having various modifications in the best mode suitable for the particular applications contemplated.

[0106] This disclosure applies to various footwear styles (in addition to the basic ballet flat / slipper shown in the drawings). For example, sandals, flip-flops, and active sports shoes having similar configurations for flexible compression and compact storage can be made, and these can be fully included within the scope of the invention. Further, although embodiments designed for women have been disclosed, it will be apparent that such shoes may be designed for men or children, or for combinations of women, men, and children. All such alternative designs are fully included within the scope of this disclosure.

[0107] The core shoe designs and compact storage pouches described herein provide the potential for surface differentiation by adornment, materials, and color, thereby increasing commercial appeal. Alternative construction methods may include adhering the outsoles to the midsoles without any stitching. The present invention is limited only by the language of the appended claims and the full scope of equivalents to which such claims are entitled.

Claims

1. An upper forming an inner portion for receiving a woman's foot, the inner portion comprising a toe cavity and a heel cavity, and a midsole having (i) a toe end, (ii) a heel end, (iii) an inner side portion, and (iv) an outer side portion, the outer edge portion of the midsole being stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, the midsole; a heel outsole patch stitched to the heel portion of the first surface of the midsole; a toe outsole patch stitched to the toe portion of the first surface of the midsole; an insole fixed to the bottom of the inner portion by an adhesive; A shoe comprising: There is a space between (i) the heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, the space extending from the inner side portion to the outer side portion and occupying a position intermediate the toe end and the heel end, whereby the entire shoe is foldable about an axis in the space extending between the inner side portion and the outer side portion; The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity; (i) The insole is not stitched to the upper or the midsole; (ii) The heel outsole patch and the toe outsole patch are each made of an elastomer; A shoe.

2. The shoe according to claim 1, wherein the midsole is made of leather.

3. The shoe according to claim 1, wherein the bottom of the inner portion further comprises a foam inlay, and the insole is fixed to the foam inlay by an adhesive.

4. The shoe according to claim 1, wherein the inner portion further comprises a cushion insert adhered to the heel portion of the second surface of the midsole.

5. The midsole comprises a second surface having a heel portion and a toe portion. The inner portion further comprises a cushion insert adhered to the heel portion of the second surface of the midsole. The foamed inlay is (i) a cushion insert and (ii) adhered to the toe portion of the second surface of the midsole, the shoe of claim 3. **Claim 6** The cushion insert is characterized by a first end portion and a second end portion. The first end portion of the cushion insert is adhered to a first portion of the heel portion, the second end portion of the cushion insert is adhered to a second portion of the heel portion, and the first portion of the heel portion is closer to the toe portion of the second surface of the midsole than the second portion of the heel portion. The first end portion of the cushion insert is thinner than the second end portion of the cushion insert. The shoe of claim 4. **Claim 7** The cushion insert thickens along the insert as a function of the distance from the toe portion of the second surface of the midsole such that the portion of the cushion insert closest to the toe portion of the midsole is thinner than the portion of the cushion insert furthest from the toe portion of the midsole, the shoe of claim 4. **Claim 8** The cushion insert comprises a material of ethylene vinyl acetate type or polyurethane type, the shoe of claim 4. **Claim 9** The cushion insert has a Shore A hardness of 45 to 70, the shoe of claim 4. **Claim 10** The cushion insert has a Shore A hardness of 60 to 70, the shoe of claim 4. **Claim 11** The cushion insert has a density of 0.30 g / cm ３ to 0.7 g / cm ３ and the shoe according to claim 4. **Claim 12** The cushion insert has a density of 0.40 g / cm ３ to 0.7 g / cm ３ and is the shoe according to claim 4. **Claim 13** A first groove portion having a depth of at least 3 / 64 inches is formed adjacent to the outer side portion of the heel outsole patch, and the heel outsole patch is stitched to the heel portion of the first surface of the midsole using a first thread occupying the first groove portion. A second groove portion having a depth of at least 3 / 64 inches is formed adjacent to the outer side portion of the toe outsole patch, and the toe outsole patch is stitched to the toe portion of the first surface of the midsole using a second thread occupying the second groove portion. The shoe of claim 1. **Claim 14** The upper is integrally formed with a first end and a second end, and the first end and the second end are integrated by a second seam in the heel cavity, the shoe according to claim 1.

15. The upper is integrally formed with (i) a first end, (ii) a second end, (iii) a first edge, and (iv) a second edge, the first end and the second end are integrated by a second seam in the heel cavity, the first edge is stitched to the outer side portion of the midsole, whereby the bottom is formed with respect to the inner portion, a first portion of the second edge is characterized by an elastic limiting portion, and the first portion of the second edge does not extend to the heel cavity, the shoe according to claim 1.

16. A second portion of the second edge is characterized by an Achilles cushion that provides an upper boundary with respect to the heel cavity, the shoe according to claim 15.

17. The upper is integrally formed with a first end and a second end, the first end and the second end are integrated by a second seam in the heel cavity, a semi-circular piece covers a lower portion of the second seam, the shoe according to claim 1.

18. The shoe is in a folded state and is pushed into a pouch having a drawstring, the shoe according to claim 1.

19. The pouch is provided with a pocket for holding a foldable tote bag, and the tote bag is configured to accommodate a pair of shoes, the shoe according to claim 18.

20. The shoe is in a folded state and is pushed into a compact box having a lid, the shoe according to claim 1.

21. A rear corner of the toe outsole patch is within 1 / 4 inch of a portion of the first seam, the shoe according to claim 1.

22. A rear corner of the toe outsole patch is within 3 / 16 inch of a portion of the first seam, the shoe according to claim 1.

23. A front corner of the toe outsole patch is within 1 / 4 inch of a portion of the first seam, the shoe according to claim 1.

24. A rear corner of the heel outsole patch is within 3 / 16 inch of a portion of the first seam, the shoe according to claim 1.

25. A rear corner of the heel outsole patch is within 1 / 4 inch of a portion of the first seam, the shoe according to claim 1. Claim 26 The toe outsole patch or the heel outsole patch of the shoe according to claim 1 has a durability coefficient of 0.8 to 1.

5. Claim 27 The toe outsole patch or the heel outsole patch of the shoe according to claim 1 has a durability coefficient of 1.0 to 1.

3. Claim 28 The heel outsole patch and the toe outsole patch of the shoe according to claim 1 each have a thickness of at least 3 / 32 inch. Claim 29 The heel outsole patch and the toe outsole patch of the shoe according to claim 1 each have a thickness of at least 5 / 32 inch. Claim 30 The interval of the shoe according to claim 1 is 4 / 8 inch to 6 / 8 inch. Claim 31 The interval of the shoe according to claim 1 is about 5 / 8 inch. Claim 32 When the shoe is worn on a woman's foot standing on a horizontal plane, the side portion of the heel outsole patch is visible at an angle of at least 45 degrees from the horizontal plane, for the shoe according to claim 1. Claim 33 When the shoe is worn on a woman's foot standing on a horizontal plane, the side portion of the toe outsole patch is visible at an angle of at least 45 degrees from the horizontal plane, for the shoe according to claim 1. Claim 34 The region of the shoe defined by the heel outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.40 kilogram weight per inch to 0.70 kilogram weight per inch, for the shoe according to claim 1. Claim 35 The region of the shoe defined by the heel outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.45 kilogram weight per inch to 0.55 kilogram weight per inch, for the shoe according to claim 1. Claim 36 The region of the shoe defined by the toe outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.40 kilogram weight per inch to 0.70 kilogram weight per inch, for the shoe according to claim 1. Claim 37 The region of the shoe defined by the toe outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.45 kilogram weight per inch to 0.55 kilogram weight per inch, for the shoe according to claim 1. Claim 38 An upper forming an inner portion for receiving a female foot, the inner portion having a toe cavity and a heel cavity, A midsole having (i) a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, the outer edge portion of the midsole being stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, the midsole, A heel outsole patch stitched to the heel portion of the first surface of the midsole, A toe outsole patch stitched to the toe portion of the first surface of the midsole, An insole fixed to the bottom of the inner portion by an adhesive, A shoe comprising, There is a space between (i) the heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, the space extending from the inner side portion to the outer side portion and occupying a position intermediate the toe end portion and the heel end portion, whereby the whole shoe can be folded about an axis in the space extending between the inner side portion and the outer side portion, The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity, (i) The insole is not stitched to the upper, (ii) The region of the shoe defined by the heel outsole patch and comprising corresponding portions of the midsole and the insole has a spring constant of 0.40 kgf / inch to 0.70 kgf / inch, A shoe.

39. An upper forming an inner portion for receiving a female foot, the inner portion having a toe cavity and a heel cavity, A midsole having (i) a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, the outer edge portion of the midsole being stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, the midsole, A heel outsole patch stitched to the heel portion of the first surface of the midsole; A toe outsole patch stitched to the toe portion of the first surface of the midsole; An insole fixed to the bottom of the inner portion by an adhesive; A shoe comprising: (i) The heel outsole patch stitched to the heel portion of the first surface of the midsole, and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole have a gap therebetween, the gap extending from the inner side portion to the outer side portion and occupying a position intermediate the toe end and the heel end, whereby the whole shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion; The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity; (i) The insole is not stitched to the upper; (ii) The rear corner of the toe outsole patch is within 1 / 4 inch of a portion of the first seam; A shoe.

40. An upper forming an inner portion for receiving a woman's foot, the inner portion including a toe cavity and a heel cavity; A midsole having (i) a toe end, (ii) a heel end, (iii) an inner side portion, and (iv) an outer side portion, the outer edge of the midsole being stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam; A heel outsole patch stitched to the heel portion of the first surface of the midsole; A toe outsole patch stitched to the toe portion of the first surface of the midsole; An insole fixed to the bottom of the inner portion by an adhesive; A shoe comprising: (i) a heel outsole patch stitched to the heel portion of the first surface of the midsole; and (ii) a toe outsole patch stitched to the toe portion of the first surface of the midsole, there is a gap between them, the gap extends from the inner side portion to the outer side portion, occupies a position intermediate the toe end portion and the heel end portion, whereby the entire shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion, The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane; and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity, (i) The insole is not stitched to the upper, (ii) A first groove portion having a depth of at least 3 / 64 inches is formed adjacent to the outer side of the heel outsole patch, and the heel outsole patch is stitched to the heel portion of the first surface of the midsole using a first thread occupying the first groove portion, (iii) A second groove portion having a depth of at least 3 / 64 inches is formed adjacent to the outer side of the toe outsole patch, and the toe outsole patch is stitched to the toe portion of the first surface of the midsole using a second thread occupying the second groove portion, Shoe.

41. An inner portion for receiving a female foot, an upper forming an inner portion having a toe cavity and a heel cavity, A midsole having (i) a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, the outer side of the midsole being stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, the midsole, A heel outsole patch stitched to the heel portion of the first surface of the midsole, A toe outsole patch stitched to the toe portion of the first surface of the midsole, An insole fixed to the bottom of the inner portion by an adhesive, A shoe comprising (i) the heel outsole patch stitched to the heel portion of the first surface of the midsole; and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, there is a gap between them, the gap extends from the inner side portion to the outer side portion, occupies a position intermediate between the toe end portion and the heel end portion, whereby the entire shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion. The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane; and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. (i) The area of the shoe defined by the heel outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.45 kgf / inch to 0.55 kgf / inch. (ii) The toe outsole patch or the heel outsole patch has a durability coefficient of 0.8 to 1.

5. Shoe.

42. A method of manufacturing a shoe, (A) stitching a heel outsole patch to the heel portion of the first surface of the midsole; (B) stitching a toe outsole patch to the toe portion of the first surface of the midsole; (C) fixing a cushion insert to the heel portion of the second surface of the midsole; (D) stitching an upper forming an inner portion for receiving a woman's foot and having a toe cavity and a heel cavity to the midsole having (i) a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, whereby by stitching (D), the outer edge portion of the midsole is stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam. (E) fixing an insole to the bottom of the inner portion with an adhesive. including The sewing (A) and the sewing (B) form a gap between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole. The gap extends from the inner side portion to the outer side portion and occupies a position intermediate between the toe end portion and the heel end portion. Thereby, the entire shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion. The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. (i) The insole is not sewn to the upper or the midsole. (ii) The heel outsole patch and the toe outsole patch are each made of an elastomer. Method.

43. A method for manufacturing a shoe, comprising: (A) sewing a heel outsole patch to the heel portion of the first surface of the midsole; (B) sewing a toe outsole patch to the toe portion of the first surface of the midsole; (C) sewing an upper forming an inner portion for receiving a woman's foot and having a toe cavity and a heel cavity to the midsole having (i) a toe end portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion. By sewing (C), the outer peripheral portion of the midsole is sewn to the upper, thereby forming a bottom for the inner portion surrounded by a first seam. (D) fixing an insole to the bottom of the inner portion with an adhesive. Including The sewing (A) and the sewing (B) form a gap between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole. The gap extends from the inner side portion to the outer side portion and occupies a position intermediate between the toe end portion and the heel end portion. Thereby, the entire shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion. The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are on the same plane or substantially on the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. (i) The region of the shoe defined by the heel outsole patch and including the corresponding portions of the midsole and the insole has a spring constant of 0.45 kgf / inch to 0.55 kgf / inch. (ii) The toe outsole patch or the heel outsole patch has a durability coefficient of 0.8 to 1.

5. Method.

44. The shoe according to claim 1, wherein the shoe is in a folded state and is associated with a foldable tote bag.

45. The shoe according to claim 44, wherein the tote bag is compressible.

46. The shoe according to claim 45, wherein the tote bag is compressible within a self-storing pocket made of a material extensible in two directions, and the self-storing pocket compresses the tote bag when compressed within the self-storing pocket.

47. The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M wherein, in the formula, D is the average depth of the groove portion in the toe outsole patch used for sewing the outsole patch to the toe portion of the first surface of the midsole, T is the average thickness of the toe outsole patch, W is the maximum width of the toe outsole patch, M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, and the OR ratio of the shoe is greater than 7.

0. A shoe according to any one of claims 1 to 37.

48. An upper forming an inner part for receiving a female foot, the inner part having a toe cavity and a heel cavity, and A midsole having (i) a toe end, (ii) a heel end, (iii) an inner side portion, and (iv) an outer side portion, wherein an outer edge portion of the midsole is sewn to the upper, thereby forming a bottom for the inner part surrounded by a first seam, the midsole; A heel outsole patch sewn to a heel portion of a first surface of the midsole; A toe outsole patch sewn to a toe portion of the first surface of the midsole; An insole fixed to the bottom of the inner part; A shoe comprising: (A) There is a gap between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole, the gap extending from the inner side portion to the outer side portion and occupying a position intermediate the toe end and the heel end, whereby the whole shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion; (B) The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that a portion of the upper including the toe cavity is pushed into the heel cavity; (C) The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M where, in the formula, D is the average depth of a groove portion in the toe outsole patch used for sewing the outsole patch to the toe portion of the first surface of the midsole; T is the average thickness of the toe outsole patch; W is the maximum width of the toe outsole patch; M is the width of the midsole at a point of the maximum width of the toe outsole patch, provided that M is greater than W, and the OR ratio of the shoe is greater than 7.0; The shoe.

49. The shoe according to claim 48, wherein the outsole ratio is 7.0 to 9.

0.

50. The shoe according to claim 48, wherein the outsole ratio is greater than 7.

6.

51. The shoe according to claim 48, wherein the outsole ratio is greater than 8.

0.

52. The shoe according to claim 48, wherein the outsole ratio is greater than 8.

4.

53. The shoe according to claim 48, wherein D is 2.0 mm to 4.0 mm.

54. The shoe according to claim 48, wherein T is 3.0 mm to 10.0 mm.

55. The shoe according to claim 48, wherein W is 60 mm to 89 mm.

56. The shoe according to claim 48, wherein M is 70 mm to 93 mm.

57. An upper forming an inner portion for receiving a female foot, the inner portion having a toe cavity and a heel cavity, A midsole having (i) a toe end, (ii) a heel end, (iii) an inner side portion, and (iv) an outer side portion, wherein an outer edge portion of the midsole is sewn to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, the midsole, A heel outsole patch sewn to a heel portion of a first surface of the midsole, A toe outsole patch sewn to a toe portion of the first surface of the midsole, An insole fixed to the bottom of the inner portion by an adhesive, A shoe comprising: There is a space between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole, the space extending from the inner side portion to the outer side portion and occupying a position intermediate the toe end and the heel end, whereby the entire shoe is foldable about an axis in the space extending between the inner side portion and the outer side portion, The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that a portion of the upper including the toe cavity is pushed into the heel cavity. (A) The area of the shoe defined by the heel outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of from 0.40 kilogram weight per inch to 0.70 kilogram weight per inch, (B) The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M where, in the formula, D is the average depth of the groove in the toe outsole patch used to sew the outsole patch to the toe portion of the first surface of the midsole, T is the average thickness of the toe outsole patch, W is the maximum width of the toe outsole patch, M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W and the OR ratio of the shoe is greater than 7.0, Shoe.

58. An upper forming an inner portion for receiving a female foot and comprising a toe cavity and a heel cavity, (i) A midsole having a toe end, (ii) a heel end, (iii) an inner side portion, and (iv) an outer side portion, wherein the outer edge portion of the midsole is stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam, a midsole, A heel outsole patch stitched to the heel portion of the first surface of the midsole, A toe outsole patch stitched to the toe portion of the first surface of the midsole, An insole fixed to the bottom of the inner portion, A shoe comprising: (i) There is a space between the heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, and the space extends from the inner side portion to the outer side portion and occupies a position intermediate the toe end and the heel end, whereby the whole of the shoe can be folded about an axis in the space extending between the inner side portion and the outer side portion, The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are on the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. (i) The rear corner of the toe outsole patch is within 1 / 4 inch of the portion of the first seam. (ii) The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M where, in the formula, D is the average depth of the groove in the toe outsole patch used to stitch the outsole patch to the toe portion of the first surface of the midsole. T is the average thickness of the toe outsole patch. W is the maximum width of the toe outsole patch. M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, and the OR ratio of the shoe is greater than 7.

0. Shoe.

59. An upper forming an inner portion for receiving a female foot, the inner portion having a toe cavity and a heel cavity. A midsole having (i) a toe end, (ii) a heel end, (iii) an inner side, and (iv) an outer side, the outer edge of the midsole being stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam. A heel outsole patch stitched to the heel portion of the first surface of the midsole. A toe outsole patch stitched to the toe portion of the first surface of the midsole. An insole fixed to the bottom of the inner portion. A shoe comprising (i) There is a space between the heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, the space extending from the inner side to the outer side and occupying a position intermediate the toe end and the heel end, whereby the entire shoe can be folded about an axis in the space extending between the inner side and the outer side. The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are on the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. (i) The area of the shoe defined by the heel outsole patch and comprising the corresponding portions of the midsole and the insole has a spring constant of 0.45 kgf / inch to 0.55 kgf / inch. (ii) The toe outsole patch or the heel outsole patch has a durability coefficient of 0.8 to 1.

5. (iii) The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M where, in the formula, D is the average depth of the groove in the toe outsole patch used to stitch the outsole patch to the toe portion of the first surface of the midsole. T is the average thickness of the toe outsole patch. W is the maximum width of the toe outsole patch. M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, and the OR ratio of the shoe is greater than 7.

0. Shoe.

60. A method of manufacturing a shoe, comprising: (A) stitching a heel outsole patch to the heel portion of the first surface of the midsole; (B) stitching a toe outsole patch to the toe portion of the first surface of the midsole; (C) fixing a cushion insert to the heel portion of the second surface of the midsole; (D) stitching an upper forming an inner portion for receiving a woman's foot and comprising a toe cavity and a heel cavity to the midsole having (i) a toe end, (ii) a heel end, (iii) an inner side portion, and (iv) an outer side portion, wherein by stitching (D), the outer edge portion of the midsole is stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam; (E) fixing an insole to the bottom of the inner portion. and The sewing (A) and the sewing (B) form a gap between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole. The gap extends from the inner side portion to the outer side portion and occupies a position intermediate between the toe end portion and the heel end portion. Thereby, the entire shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion. The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M wherein, D is the average depth of the groove portion in the toe outsole patch used for sewing the outsole patch to the toe portion of the first surface of the midsole. T is the average thickness of the toe outsole patch. W is the maximum width of the toe outsole patch. M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, and the OR ratio of the shoe is greater than 7.

0. Method. [

61. ] The shoe according to claim 48, wherein T is greater than 5.0 mm. [

62. ] The shoe according to claim 48, wherein T is greater than 8.0 mm. [

63. ] The shoe according to claim 1, wherein the toe outsole patch has a thickness exceeding 5.0 mm. [

64. ] The shoe according to claim 48, wherein D is less than 2.0 mm. [

65. ] The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M wherein, D is the average depth of the groove portion in the toe outsole patch used for sewing the outsole patch to the toe portion of the first surface of the midsole. T is the average thickness of the toe outsole patch. W is the maximum width of the toe outsole patch. M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, the OR ratio of the shoe is greater than 7.0, the shoe has a women's shoe size selected from any of the women's shoe sizes described in Table 1, and the values for D, T, W, and M are those given in Table 1 for the selected women's shoe size. The shoe according to any one of claims 1 to 37.

66. An upper forming an inner portion for receiving a woman's foot, the inner portion comprising a toe cavity and a heel cavity. A midsole having (i) a toe end, (ii) a heel end, (iii) an inner side, and (iv) an outer side, wherein the outer edge portion of the midsole is stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam. A heel outsole patch stitched to the heel portion of the first surface of the midsole. A toe outsole patch stitched to the toe portion of the first surface of the midsole. An insole fixed to the bottom of the inner portion. A shoe comprising: (A) There is a gap between (i) the heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, the gap extending from the inner side to the outer side and occupying a position intermediate the toe end and the heel end, whereby the entire shoe can be folded about an axis in the gap extending between the inner side and the outer side. (B) The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. (C) The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M where, in the formula, D is the average depth of the groove portion in the toe outsole patch used for stitching the outsole patch to the toe portion of the first surface of the midsole. T is the average thickness of the toe outsole patch. W is the maximum width of the toe outsole patch, M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, the OR ratio of the shoe is greater than 7.0, the shoe has a women's shoe size selected from any of the women's shoe sizes described in Table 1, and the values for D, T, W, and M are given in Table 1 for the selected women's shoe size, a shoe.

67. The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M wherein, D is the average depth of the groove in the toe outsole patch used to stitch the outsole patch to the toe portion of the first surface of the midsole, T is the average thickness of the toe outsole patch, W is the maximum width of the toe outsole patch, M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, the OR ratio of the shoe is greater than 7.0, the shoe has a women's shoe size selected from any of the women's shoe sizes described in Table 1, and the values for D, T, W, and M are given in Table 2 for the selected women's shoe size, The shoe according to any one of claims 1 to 37.

68. An upper forming an inner part for receiving a woman's foot, the inner part comprising a toe cavity and a heel cavity, a midsole having (i) a toe end, (ii) a heel end, (iii) an inner side portion, and (iv) an outer side portion, wherein the outer edge portion of the midsole is stitched to the upper, thereby forming a bottom for the inner part surrounded by a first seam, the midsole, a heel outsole patch stitched to the heel portion of the first surface of the midsole, a toe outsole patch stitched to the toe portion of the first surface of the midsole, an insole fixed to the bottom of the inner part, a shoe comprising (A) (i) The heel outsole patch stitched to the heel portion of the first surface of the midsole, and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, there is a gap between them, the gap extends from the inner side portion to the outer side portion, occupies a position intermediate between the toe end and the heel end, whereby the whole shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion, (B) The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane, and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity, (C) The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M where, in the formula, D is the average depth of the groove portion in the toe outsole patch used for stitching the outsole patch to the toe portion of the first surface of the midsole, T is the average thickness of the toe outsole patch, W is the maximum width of the toe outsole patch, M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, the OR ratio of the shoe is greater than 7.0, the shoe has a women's shoe size selected from any of the women's shoe sizes described in Table 1, and the values for D, T, W, and M are given in Table 2 for the selected women's shoe size, The shoe.

69. The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M where, in the formula, D is the average depth of the groove portion in the toe outsole patch used for stitching the outsole patch to the toe portion of the first surface of the midsole, T is the average thickness of the toe outsole patch, W is the maximum width of the toe outsole patch, M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, the OR ratio of the shoe is greater than 7.0, the shoe has a women's shoe size selected from any of the women's shoe sizes described in Table 1, and the values for D, T, W, and M are given in Table 3 for the selected women's shoe size. The shoe according to any one of claims 1 to 37.

70. An upper forming an inner part for receiving a woman's foot, the inner part comprising a toe cavity and a heel cavity, A midsole having (i) a toe end, (ii) a heel end, (iii) an inner side portion, and (iv) an outer side portion, wherein the outer side portion of the midsole is stitched to the upper, thereby forming a bottom for the inner part surrounded by a first seam. A midsole, A heel outsole patch stitched to the heel portion of the first surface of the midsole, A toe outsole patch stitched to the toe portion of the first surface of the midsole, An insole fixed to the bottom of the inner part, A shoe comprising: (A) There is a gap between (i) the heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole. The gap extends from the inner side portion to the outer side portion and occupies a position intermediate the toe end and the heel end, whereby the entire shoe can be folded about an axis in the gap extending between the inner side portion and the outer side portion. (B) The shoe is configured to be folded between (i) an extended state in which the heel outsole patch and the toe outsole patch are in the same plane or substantially the same plane and (ii) a folded state in which the shoe is bent about the axis such that the portion of the upper including the toe cavity is pushed into the heel cavity. (C) The shoe has a maximum outsole ratio OR, provided that OR = (D × T × W) / M where, in the formula, D is the average depth of the groove portion in the toe outsole patch used to stitch the outsole patch to the toe portion of the first surface of the midsole, T is the average thickness of the toe outsole patch, W is the maximum width of the toe outsole patch, M is the width of the midsole at the point of the maximum width of the toe outsole patch, provided that M is greater than W, the OR ratio of the shoe is greater than 7.0, the shoe has a women's shoe size selected from any of the women's shoe sizes described in Table 1, and the values for D, T, W, and M are given in Table 3 for the selected women's shoe size, a shoe.

71. The shoe according to claim 15, wherein the second portion of the second edge is characterized by an Achilles area that is shaved to reduce its depth.

72. The upper is integrally formed having (i) a first end, (ii) a second end, (iii) a first edge, and (iv) a second edge, the first end and the second end are integrated by a second seam in the heel cavity, the first edge is stitched to the outer side portion of the midsole, thereby forming the bottom with respect to the inner portion, the first portion of the second edge is characterized by an elastic limiting portion, and the first portion of the second edge does not extend to the heel cavity, the second portion of the second edge is characterized by an Achilles area that is shaved to reduce its depth, the shoe according to claim 48.

73. The upper is integrally formed having (i) a first end, (ii) a second end, (iii) a first edge, and (iv) a second edge, the first end and the second end are integrated by a second seam in the heel cavity, the first edge is stitched to the outer side portion of the midsole, thereby forming the bottom with respect to the inner portion, the first portion of the second edge is characterized by an elastic limiting portion, the first portion of the second edge does not extend to the heel cavity, and the elastic limiting portion is stitched to the shoe without using an adhesive, the shoe according to claim 1.

74. The upper is integrally formed having (i) a first end, (ii) a second end, (iii) a first edge, and (iv) a second edge, the first end and the second end are integrated by a second seam in the heel cavity, the first edge is stitched to the outer side portion of the midsole, thereby forming the bottom with respect to the inner portion, The first part of the second edge is characterized by an elastic limiting part, the first part of the second edge does not extend to the heel cavity, and the elastic limiting part is sewn to the shoe without using an adhesive. The shoe according to claim 48.

75. The shoe according to claim 1, wherein the midsole is reinforced using a flexible material fixed to a non-exposed part of the midsole.

76. The shoe according to claim 48, wherein the midsole is reinforced using a flexible material fixed to a non-exposed part of the midsole.

77. The shoe according to claim 1, wherein the bottom of the inner part further comprises a foamed insole, the insole is fixed to the foamed insole by an adhesive, and a rigid insert is inserted between the foamed insole and the midsole.

78. The shoe according to claim 48, wherein the bottom of the inner part further comprises a foamed insole, the insole is fixed to the foamed insole by an adhesive, and a rigid insert is inserted between the foamed insole and the midsole.

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