midsole

Abstract

Disclosed herein is a midsole (1) for a shoe, the midsole (1) comprising: a plurality of first channels (2a, 2b, 2c) extending from a first side of the midsole (1) in the direction of a second side of the midsole (1), wherein the second side of the midsole (1) is oppositely arranged to the first side of the midsole (1), wherein the first channels (2a, 2b, 2c) do not extend up to the second side of the midsole (1); a plurality of second channels (3a, 3b, 3c) being different from the first channels (2a, 2b, 2c), wherein the second channels (3a, 3b, 3c) extend from the second side of the midsole (1) in the direction of the first side of the midsole (1), wherein the second channels (3a, 3b, 3c) do not extend up to the first side of the midsole (1); wherein the first channels (2a, 2b, 2c) and the second channels (3a, 3b, 3c) are offset to each other.

Description

[0001] Midsole

[0002] Field of disclosure

[0003] The present invention lies in the field of footwear cushioning technology and relates to a midsole for a shoe as well as a shoe comprising such a midsole.

[0004] Background, prior art

[0005] Cushioning soles are prominently used in different sports shoes to prevent injuries, such as knee, ankle, hip and back injuries. This is particularly important in sports in which repeating high impact forces occur, such as running. To prevent these injuries, many different cushioning systems have been developed over time. They comprise for example gas filled chambers, resilient elements, advanced polymer foams, shock absorbing buffer structures and channel cushioning. The latter typically envisions channels in the sole structure which extend completely from the medial side to the lateral side of the sole. Such channels have therefore each two openings, i.e. a lateral opening on the lateral side of the sole and a medial opening on the medial side through the sole. Typically, the channels are filled with ambient air. By means of the medial and lateral openings, the channels are in fluidic connection with the environment. If the sole is loaded with a force, the sole can deform, which leads to a decreasing channel open area, because the air inside the channels is vented out of the channel through the medial and lateral opening, and the channel wall sections which delimit the channels are moved towards each other. An important advantage of such channel cushioning over many other systems is that the soles are easy to manufacture, because the channels can directly be introduced during molding or foam molding by suitable molding pins. Further, these soles can be manufactured as single pieces, because the cushioning system is operationally simple to produce and does not require multiple different parts which have to be assembled together as it is the case for other cushioning systems. For example, in gas filled bladder cushioning systems, the bladder shell must be made from different material than the rest of the sole as it must be gas tight. Also shock absorbing buffer structures often require different materials for the buffer structures as compared to the rest of the sole. Therefore, channel cushioning has advantages in view of ease of production, material demand, cost and recyclability, because it requires a lower number of different materials.

[0006] A problem with such channel cushioning is however that the channels can cause instabilities, in particular during tread (i.e. when the foot contacts the ground). This is particularly problematic if treading is not neutral (neutral meaning that the sole extends in parallel to the ground), but if it occurs under pronation or supination of the runner’s foot. This may either be caused by the anatomic prerequisites of the runner or by an uneven ground, such as a step, a stone, a tree branch or the like. Although channel cushioning as described above achieves good cushioning, it may cause such instabilities which may lead to both immediate injuries and to long term issues.

[0007] Summary of disclosure

[0008] It is the general object of the present invention to advance the state of the art of cushioning footwear technology and preferably to overcome the disadvantages of the prior art fully or at least partly. In advantageous embodiments, a midsole is provided which has the advantages of channel cushioning systems, but prevents instabilities, in particular during tread which may for example cause immediate injuries or long term issues for the runner.

[0009] The general object is achieved by the subject-matter of the independent claim. Further advantageous embodiments follow from the dependent claims and the overall disclosure.

[0010] A first aspect of the invention relates to a midsole for a shoe, in particular for a running shoe. A second aspect of the invention relates to a sole structure with such a midsole and a third aspect of the invention relates to a shoe with such a midsole or with such a sole structure.

[0011] The midsole may comprise a plurality of first channels and a plurality of second channels which are different from the first channels. The first channels extend from a first side of the midsole in the direction of, i.e. towards, a second side of the midsole. This second side of the midsole is oppositely arranged to the first side of the midsole. As will be described in further detail below, it may for example be possible that the first and second side are the lateral and medial side of the midsole or the top and bottom side of the midsole. The first channels may not extend up to, i.e. all the way up to, the second side of the midsole. That is, the first channels may not penetrate through the midsole from the first side to the second side. In contrast, the first channels start at the first side, extend towards the opposing second side and have a channel end being spaced apart from the second side.

[0012] The second channels may extend from the second side of the midsole towards the first side of the midsole. The second channels may not extend up to, i.e. all the way up to, the first side of the midsole. That is, the second channels may not penetrate through the midsole from the second side to the first side. In contrast, the second channels start at the second side, extend towards the opposing first side and have a channel end being spaced apart from the first side. Additionally, the first channels and the second channels may particularly be offset to each other. In particular, all first channels and second channels may be offset to each other. The first channels and the second channels may in particular extend towards each other. However, since they are offset to each other, they do not directly face onto each other. In particular embodiments, the first channels and the second channels are completely, i.e. fully, offset to each other.

[0013] A midsole as described herein may typically have a midsole tip, which defines the front limit of the midsole and a heel edge, which is oppositely arranged to the midsole tip and defines the rear end of the midsole. Further, the midsole may have a lateral side and a medial side which are oppositely arranged and which may meet each other at the midsole tip and the heel edge. The midsole may also comprise a top side and an oppositely arranged bottom side. The top side is in the worn state facing the foot of the wearer, respectively is arranged closer to the foot of the wearer, and the bottom side is in the worn state facing the ground, respectively is arranged closer to the ground.

[0014] Directional indications as used in the present disclosure are to be understood as follows:

[0015] The longitudinal direction of the midsole is described by an axis from the heel area, respectively from the heel edge, to the forefoot region, respectively to the midsole tip, and thus extends along the longitudinal axis of the midsole. The transverse direction of the midsole, extends transversely to the longitudinal axis and substantially parallel to the bottom side of the midsole, or substantially parallel to the ground in the operative, i.e. worn, state. Thus, the transverse direction runs along a transverse axis of the midsole. In the context of the present invention, the vertical direction V denotes a direction from the bottom side to the top side of the midsole, or in the operative state in the direction of the foot of the wearer, and thus runs along a vertical axis of the midsole respectively the shoe sole. The longitudinal direction, the vertical direction and the transverse direction may all be perpendicular to each other. The lateral side of the midsole is the outer perimeter of the midsole between the heel edge and the midsole tip, which in the worn state rests against the outer instep of the wearer's foot. The indication “horizontal” refers to a plane extending in the longitudinal and the transverse direction and being perpendicular to the vertical direction. The medial side of the midsole, refers to the inner perimeter of the midsole between the heel edge and the midsole tip, which is located opposite the lateral side. Thus, in a pair of worn running shoes, the medial sides of the two running shoes face each other and the lateral sides face away from each other. Furthermore, the midsole may typically along the longitudinal direction be divided into a forefoot area, a heel area and a midfoot area being arranged between the forefoot area and the heel area. For example, the forefoot area extends from the midsole tip against, i.e. opposite, the longitudinal direction to 30-45% of the total length of the midsole in the longitudinal direction. The heel area extends, for example, from the heel edge in the longitudinal direction to 20-30% of the total length of the midsole in the longitudinal direction. The midfoot area extends directly between the heel area and the forefoot area, such that the length in the longitudinal direction of the midfoot area makes up the remaining portion of the total length, particularly from 15-50% of the total length.

[0016] It is generally understood herein that the term “comprising” is interpreted as meaning that it includes those features following this term, but that it does not exclude the presence of other features, as long as they do not render the claim unworkable. On the other hand, if the wording "consist of" is used, then no further features are present apart from the ones following said wording.

[0017] In some embodiments, the first channels and the second channels are along the longitudinal direction offset to each other. This means that if one travels along the longitudinal direction, for example from the heel edge to the midsole tip, the first and second channels, which may generally be inclined, in particular perpendicular, to the longitudinal direction, do not face each other but are offset to each other. For example, a given first channel may be arranged closer to the heel edge than a given second channel, in particular an adjacent second channel.

[0018] In some embodiments, the first channels and the second channels are configured as blind holes. Therefore, the invention may in some embodiments relate to a midsole for a shoe, the midsole comprising: a. a plurality of first channels being configured as blind holes and extending from a first side of the midsole towards a second side of the midsole, wherein the second side of the midsole is oppositely arranged to the first side of the midsole; b. a plurality of second channels being different from the first channels, wherein the second channels are configured as blind holes and extend from the second side of the midsole towards the first side of the midsole; wherein the first channels and the second channels are offset to each other.

[0019] In some embodiments, the midsole may comprise at least 3, in particular at least 5, more particular at least 7, first channels and at least 3, in particular at least 5, more particular at least 7, second channels.

[0020] In some embodiments, the midsole may comprise between 3 and 20, in particular between 5 and 15, more particular between 7 and 12, even more particular between 7 and 10, first channels. In some embodiments, the midsole may comprise between 3 and 20, in particular between 5 and 15, more particular between 7 and 12, even more particular between 7 and 10, second channels.

[0021] In some embodiments, at least some of the first channels and at least some of the second channels are alternatingly arranged to each other. In particular, the first channels and second channel may be alternatingly arranged along the longitudinal direction. This means if one travels along the longitudinal direction from the heel edge to the midsole tip, there will first be a first channel, then a second channel, closer to the midsole tip, then again a first channel closer to the midsole tip, then a second channel closer to the midsole tip, etc.

[0022] In some embodiments, the midsole comprises alternating sections and / or non-alternating sections. In the alternating sections, the first channels and the second channels are alternatingly arranged to each other. In contrast, in the non-alternating sections, the first channels and the second channels are not alternatingly arranged. In the non-alternating sections it may for example be the case that there are more than two, in particular more than 3, adjacent first channels or more than two, in particular more than 3, adjacent second channels. In particular embodiments, such a non-alternating section may comprise only first channels (in this case it may be referred to as a first non-alternating section, or if the first channels are medial channels, a medial non-alternating section) or it may comprise only second channels (in this case it may be referred to as a second non-alternating section, or if the second channels are lateral channels, a lateral non-alternating section). It is understood that such sections may be sections extending over the complete extension of the midsole in the transverse direction. Non-alternating sections may be advantageous, because they provide cushioning at very specific areas, while for example the opposite side does then not contain channels and is therefore more stable. In certain embodiments, such non-alternating sections are arranged in the midfoot area of the midsole.

[0023] As outlined above, the first and second channels may along the longitudinal direction be arranged offset to each other. Therefore, alternating sections may be as follows: If one travels from the heel edge to the midsole tip along the longitudinal direction, there may first be a first channel, then longitudinally offset thereto a second channel being arranged closer to the midsole tip, then again a first channel follows which is again offset and closer to the midsole tip, then again a second channel follows which is again offset and closer to the midsole tip and so on. In contrast, If one travels the longitudinal direction in a non-alternating section, there may first be a first channel and the next adjacent channel is again a first channel being arranged closer to the midsole tip and the next channel is again a first channel being arranged closer to the midsole tip and so on.

[0024] In typical embodiments, the first channels and the second channels are separated from each other. For example, the first channels and second channels are not connected with each other.

[0025] In some embodiments, the first channels and the second channels are interdigitated with each other in an interdigitated area. Such an interdigitated area may for example be a centrally arranged interdigitated area or a middle interdigitated area as described in some of the embodiments herein. The interdigitated area may preferably be characterized by the fact that at least one, or even all, first channel(s) and at least one, or even all, second channel(s) is arranged in the interdigitated area. Further, the interdigitated area may generally be sandwiched between a first rim area and a second rim area. The first rim area may particularly be characterized by the fact that only the first channels are arranged in, respectively extend through, the first rim area. The second rim area may particularly be characterized by the fact that only the second channels are arranged in, respectively extend through, the second rim area. In particular embodiments, the first and second channels are interdigitated with each other along the longitudinal direction of the midsole in the interdigitated area. That is, when travelling in the interdigitated area along the longitudinal direction (e.g. from heel edge to midsole tip), first and second channels are passed. In contrast, when travelling in the first rim area along the longitudinal direction, only first channels are passed and when travelling in the second rim area along the longitudinal direction, only second channels are passed.

[0026] In some embodiments, the interdigitated area, such as the centrally arranged interdigitated area or the middle interdigitated area, extends in the longitudinal direction of the midsole between the 1. (“first” as a number not as the group of first channels) channel as seen from the heel edge (i.e. the rearmost first or second channel) up to the 1. (“first” as a number not as the group of first channels) channel as seen from the midsole tip (i.e. the foremost first or second channel). In may also be possible that the interdigitated area, such as the centrally arranged interdigitated area or the middle interdigitated area, extends in the longitudinal direction completely from the heel edge to the midsole tip. In the transverse direction, the centrally arranged interdigitated area as described in some of the embodiments herein may towards the lateral side be delimited by the medial channels, in particular by the end of the medial channels and towards the medial side by the lateral channels, in particular by the end of the lateral channels. In general, the interdigitated area may in the transverse direction towards the first side be delimited by the second channels, in particular the end of the second channels, and towards the second side by the first channels, in particular by the end of the first channels.

[0027] In certain embodiments all first and second channels are offset to each other. Therefore, there may not be any first and second channels which are aligned, or even partially aligned with each other along a certain direction, in particular the vertical direction and / or longitudinal direction and / or transversal direction.

[0028] In some embodiments the first channels are medial channels which extend from a medial side of the midsole in the direction of, e.g. towards, a lateral side of the midsole. Further, the second channels are lateral channels which extend from the lateral side of the midsole in the direction of, e.g. towards, the medial side of the midsole.

[0029] In other words, in such embodiments, the midsole according to the invention may be a midsole comprising: a. a plurality of medial channels extending from a medial side of the midsole towards a lateral side of the midsole, wherein the medial channels do not extend up to the lateral side of the midsole; b. a plurality of lateral channels being configured as blind holes and extending from the lateral side of the midsole towards the medial side of the midsole wherein the lateral channels do not extend up to the medial side of the midsole; wherein the lateral channels and the medial channels are offset to each other.

[0030] In some embodiments the first channels are medial channels which are configured as blind holes extending from a medial side of the midsole towards a lateral side of the midsole. Further, the second channels are lateral channels which are configured as blind holes extending from the lateral side of the midsole towards the medial side of the midsole.

[0031] In other words, in such embodiments, the midsole according to the invention may be a midsole comprising: a. a plurality of medial channels being configured as blind holes and extending from a medial side of the midsole towards a lateral side of the midsole; b. a plurality of lateral channels being configured as blind holes and extending from the lateral side of the midsole towards the medial side of the midsole; wherein the lateral channels and the medial channels are offset to each other.

[0032] The medial channels therefore typically each comprise an opening on the medial side of the midsole from where the channel extends, e.g. as blind hole, towards the oppositely arranged lateral side of the midsole. Vice versa, the lateral channels typically each comprise an opening on the lateral side of the midsole from where the channel extends, e.g. as blind hole, towards the oppositely arranged medial side of the midsole.

[0033] In some embodiments, the lateral channels extend along a transverse direction of the midsole from the lateral side towards the medial side. In certain embodiments, the lateral channels extend in parallel to each other. In some embodiments, the medial channels extend along the transverse direction of the midsole from the medial side towards the lateral side. In certain embodiments, the medial channels extend in parallel to each other and optionally also in parallel to the lateral channels.

[0034] In some embodiments, the medial channels and the lateral channels are interdigitated with each other in a centrally arranged interdigitated area of the midsole. It is understood that such a central area is arranged in a certain area between the lateral side and the medial side of the midsole. The centrally arranged area may typically extend in some embodiments longitudinally, i.e. in the longitudinal direction. The medial and lateral channels being interdigitated with each other in such a centrally arranged interdigitated area extend typically mainly or fully in the transverse direction of the midsole.

[0035] Interdigitated means that at least one, or even all, medial channel(s) and at least one, or even all, lateral channel(s) extend through this interdigitated area. While it can be the case that the medial and lateral channels are alternatingly arranged in the interdigitated area, it can in some embodiments be the case that there are non-alternating sections as described above present in the interdigitated area. Preferably however, at least some of the medial and lateral channels are alternatingly arranged in the interdigitated area. Thus, in the interdigitated area both lateral and medial channels are present. This significantly increases the cushioning function in the interdigitated area, because the amount of channels is increased, in particular even doubled as compared to the outer sections (i.e. the rim areas described further below). However, since the interdigitated area is centrally arranged, this does not result in a significant destabilization, in particular a destabilization which leads to pronation or supination of the foot.

[0036] In some embodiments, the midsole comprises a lateral rim area. Such a lateral rim area may be arranged between the lateral side of the midsole and the interdigitated area of the midsole. Further and in contrast to the interdigitated area, only lateral channels, in particular all lateral channels extend through the lateral rim area. In contrast, the medial channels typically do not extend through, respectively are not arranged in, the lateral rim area. Such embodiments have the advantage that the lateral rim area is stabilized as compared to the centrally arranged interdigitated area, which provides additional stabilization and prevents supination. However, since there are lateral channels present, there is still a cushioning effect in the lateral rim area, while the majority of the impact force is absorbed by the centrally arranged interdigitated area.

[0037] In some embodiments the midsole comprises a medial rim area. Such a medial rim area may be arranged between the medial side of the midsole and the interdigitated area of the midsole. Further and in contrast to the interdigitated area, only medial channels, in particular all lateral channels, extend through the medial rim area. In contrast, the lateral channels typically do not extend through, respectively are not arranged in, the medial rim area. Such embodiments have the advantage that the medial rim area is stabilized as compared to the centrally arranged interdigitated area, which provides additional stabilization and prevents pronation. However, since there are medial channels present, there is still a cushioning effect in the medial rim area, while the majority of the impact force is absorbed by the centrally arranged interdigitated area. In preferred embodiments, the midsole comprises both a medial rim area and a lateral rim area as described herein. Thus, in such embodiments, the lateral rim area and the medial rim area sandwich the centrally arranged interdigitated area. In particular, the centrally arranged interdigitated area may be circumferentially surrounded by the medial rim area and the lateral rim area. In certain embodiments, it may even be the case that the medial rim area and the lateral rim area circumferentially completely surround the centrally arranged interdigitated area in a horizontal plane being defined by the longitudinal and the transverse direction.

[0038] In some embodiments, the shape of the interdigitated area follows the main joints of the human foot which efficiently supports the movement of the foot during running and in particular its rolling motion. The shape of the interdigitated area may in particular refer to the outer periphery of the parts of the midsole in which the medial and lateral channels are interdigitated. In some embodiments, the interdigitated area has a curved shape. In particular embodiments, the shape of the interdigitated area is curved over 80% to 100% of its length. In other words, any straight, e.g. linear, portions of the interdigitated area are present at a maximum of up to 20% of its length. The length refers to the extension of the interdigitated area along the longitudinal direction of the midsole. Such a curved shape reflects the anatomical prerequisites of the human foot, such as the foot arch, and therefore efficiently supports the rolling motion during running. The curved shape typically refers to the horizontal shape of the interdigitated area, i.e. the shape in the plane defined by the longitudinal direction and the transversal direction.

[0039] In some embodiments, the curved shape of the interdigitated area comprises, respectively defines, a front vertex and a rear vertex. The front vertex is arranged closer to the midsole tip than the rear vertex. As the skilled person understands a vertex is the point of a curve where the curve undergoes a local maximum or minimum, i.e. where the first derivative of the curve is zero. It is understood that the curved shape refers, or is referenced to, a coordinate system in which the longitudinal direction represents the x-axis and the transverse direction represents the y-axis. The curved shape would then be represented by the function f(x). Since the interdigitated area has a curved shape, in particular in the horizontal plane (that is the plane defined by the longitudinal direction and the lateral direction), the curved shape may describe a front vertex and a rear vertex, in particular in the horizontal plane. In such embodiments, the interdigitated area is ideally arranged with respect to the anatomy of the human foot and therefore allows for an optimal rolling movement and minimal energy loss during running.

[0040] In some embodiments, the curved shape extends between the rear vertex and the front vertex in a lateral to medial direction. This means that the interdigitated area extends from the rear vertex in the longitudinal direction but is also curved such that it extends (e.g. only) in a lateral to medial direction until it reaches the front vertex. This does therefore not mean that the interdigitated area extends strictly in the transverse direction, but it means that it may be inclined or oblique and / or that it extends in the longitudinal direction but also in the direction of the medial side. In some embodiments, the curved shape extends between a rear limit of the interdigitated area and the rear vertex in a medial to lateral direction. That is, from the rear limit, the interdigitated area extends in the longitudinal direction and is also curved such that it extends in a medial to lateral direction until it arrives at the rear vertex. This does therefore not mean that the interdigitated area extends strictly in the transverse direction, but it means that it may be inclined or oblique and / or that it extends in the longitudinal direction but also in the direction of the lateral side between the rear limit and the rear vertex. The rear limit is the rearmost part of the interdigitated area which is typically arranged in the heel area and may even be thee heel edge.

[0041] In some embodiments, the curved shape extends between the front vertex and the front limit of the interdigitated area in a medial to lateral direction. That is, from the front vertex, the interdigitated area extends in the longitudinal direction and is also curved such that it extends in a medial to lateral direction until it arrives at the front limit. This does therefore not mean that the interdigitated area extends strictly in the transverse direction, but it means that it may be inclined or oblique and / or that it extends in the longitudinal direction but also in the direction of the lateral side between the front vertex and the front limit. The front limit is the foremost part of the interdigitated area which is typically arranged in the forefoot area and may even be the midsole tip.

[0042] In some embodiments, the front vertex is arranged at a distance of 10% to 35%, e.g. between 10% and 35%, in particular 15% to 30%, of the total length of the midsole from the midsole tip. The total length of the midsole is the distance between the foremost point of the midsole, i.e. the midsole tip and the rearmost point of the midsole, i.e. the heel edge along the longitudinal direction. Thus, in such embodiments, the front vertex is distanced apart from the midsole tip by 10% to 35%, in particular 15% to 30%, of the total length of the midsole. This is advantageous as it ensures that the front vertex is arranged below the metatarsal joints, in particular the metatarsophalangeal joints of the wearer.

[0043] In some embodiments, the rear vertex is arranged at a distance of 15% to 50%, in particular

[0044] 20% to 40%, of the total length of the midsole from the heel edge of the midsole. Thus, in such embodiments, the rear vertex is distanced apart from the heel edge by 15% to 50%, in particular 20% to 40%, of the total length of the midsole. Arranging the rear vertex at this distance provides an efficient cushioning as it ensures that the interdigitated area is arranged underneath the positions of the human foot were the impact during tread is the highest.

[0045] In some embodiments, the curved shape of the interdigitated area comprises an inflection point between the front vertex and the rear vertex. As the skilled person understands, an inflection point of a curve or a curved shape is the point at which the direction of the curve changes (e.g. a left curve goes into a right curve or vice versa). Mathematically, the second derivative at an inflection point is 0. Optionally, the inflection point is arranged at 45% to 65% of the total length of the midsole from the heel edge of the midsole. That is, the inflection point is distanced apart from the heel edge by 45% to 65% of the total length of the midsole.

[0046] In some embodiments, the centrally arranged interdigitated area, in particular its curved shape, has at a given longitudinal position of the midsole a width (i.e. extension along the transverse direction) of 15% to 50%, in particular 20% to 40%, more particular of 25% to 35%, of the total width of the midsole at this longitudinal position.

[0047] In some embodiments the channels being configured as blind holes may be completely delimited by the midsole (e.g. by. the midsole material, such as the polymer foam material) with the exception of the optional corresponding channel opening. In particular, the channels may be completely delimited by the midsole in the plane being defined by the longitudinal and vertical direction.

[0048] In some embodiments, the lateral channels and / or the medial channels are slits which are each open towards a top side of the midsole. Thus, the slits are not only open, respectively accessible from their medial or lateral opening, but also from the top side of the midsole. However, they do not extend completely through the midsole, neither in the vertical direction nor in the transversal direction and are therefore still configured as blind holes. As used herein, the term “blind hole” means that the corresponding channel being configured as a blind hole extends from a side (such as the first or second side, or the medial or lateral side) towards an opposing side but does in this direction not extend completely through the midsole and thus up to the opposing side. In other words, while the channel may have an opening on the side from which it extends it does not have an opening on the opposing side towards which it extends. In some embodiments described herein, however, the channels being configured as blind holes may in general be completely delimited by the midsole (e.g. by. the midsole material, such as the polymer foam material) with the exception of the optional corresponding channel opening, in particular in the plane defined by the longitudinal and vertical direction. Embodiments in which the lateral channels and / or medial channels are slits are advantageous, because they allow a shearing deformation of the sole and further enable that opposing channel wall sections contact each other under such shearing and under the forces occurring during running. This allows to improve cushioning of horizontally acting forces by the initial deformation and still enables a stable stand as soon as the opposing channel wall sections come in contact with each other. Further, arranging the slits such that they are open towards the top side provides a much improved cushioning as compared to slits being open towards the bottom side.

[0049] In certain embodiments, the slits each extend from the top side of the midsole therefore only partially through the midsole towards the bottom side of the midsole. However, as mentioned above, the slits do not penetrate through the midsole from the top side to the bottom side.

[0050] In some embodiments, the slits each have a slit width of 0.1 mm to 10 mm, in particular 0.5 mm to 7.5 mm. The slit width is the extension of a slit along the longitudinal direction and represents the distance of opposing channel wall sections.

[0051] In some embodiments, the midsole section between two adjacent slits of the same type (i.e. lateral slits or medial slits) is larger than the slit width of each of the adjacent slits of the same type. For example, the midsole section between two adjacent slits of the same type may have a width of 1 mm to 30 mm, in particular 5 mm to 20 mm. In certain embodiments, the width of the midsole section between two adjacent slits of the same type may be between 2x to 10x, in particular 3x to 5x, the slit width of one of the adjacent slits of the same type.

[0052] In some embodiments, the slits may each have a height of 30% to 80%, in particular 40% to 70% of the total height of the midsole. The height of the slit is the extension of the slit in the direction from the bottom side to the top side of the midsole along the slit. The total height of the midsole is the distance between the top side and the bottom side of the midsole.

[0053] In some embodiments, the slits each extend in a direction from the top side of the midsole to the bottom side of the midsole diagonally towards the heel edge. In other words, opposing channel wall sections of the slits extend in parallel inclined towards the heel edge. Therefore, the slit, respectively its opposing channel wall sections have a vertical extension and a longitudinal extension. Such embodiments are advantageous as they not only provide an improved cushioning but also a stable stand. Furthermore, since the midsole is typically made from an elastic material, such as an elastic, in particular viscoelastic, polymer foam, such slits result after forced deformation in a spring like forward propulsion which supports the runner’s movement.

[0054] In some embodiments, the lateral channels and / or the medial channels are in cross section along the longitudinal direction and perpendicular to the transverse direction of the midsole completely delimited by the midsole. In such embodiments, the medial channels open only to the medial side and are otherwise completely delimited by the midsole. Vice versa, the lateral channels open only to the lateral side and are otherwise completely delimited by the midsole.

[0055] In some embodiments, the medial channels each comprise a medial opening on the medial side of the sole. The medial channel is therefore in direct fluidic communication with the outside environment via its medial opening. In particular embodiments, the medial opening of each medial channel may be the only opening of each medial channel. Otherwise, the medial channel may be completely delimited by the midsole. Since the medial channels are configured as blind holes, they extend from the medial opening of the channel on the medial side of the midsole towards the lateral side of the midsole.

[0056] In some embodiments, the lateral channels each comprise a lateral opening on the lateral side of the sole. The lateral channel is therefore in direct fluidic communication with the outside environment via its lateral opening. In particular embodiments, the lateral opening of each lateral channel may be the only opening of each lateral channel. Otherwise, the lateral channel may be completely delimited by the midsole. Since the lateral channels are configured as blind holes, they extend from the lateral opening of the channel on the lateral side of the midsole towards the medial side of the midsole.

[0057] In some embodiments, the midsole, and in particular the lateral channels and / or the medial channels, is configured such that the medial openings and / or the lateral openings are horizontally and / or vertically deformed, in particular sheared, under the forces occurring during running such that they close completely. The forces occurring during running are generally the forces being exerted by a runner having a body weight of 40 kg to 120 kg, in particular 50 kg to 100 kg, who is running on an even ground surface with a speed of 8 to 12 km / h. Upon complete closure, a frictional lock and stable stand is achieved. Furthermore, the push-off becomes efficient, because the push off force can be readily used and is not lost by further channel deformation.

[0058] In some embodiments, the first channels are top channels being configured as blind holes extending from a top side of the midsole towards a bottom side of the midsole. Further, the second channels may in such embodiments be bottom channels being configured as blind holes extending from the bottom side of the midsole towards the top side of the midsole. Thus, in this case, the first and second opposing sides are the top side and the bottom side of the midsole.

[0059] Therefore, in some embodiments, the midsole may comprise a. a plurality of top channels being configured as blind holes and extending from a top side of the midsole towards a bottom side of the midsole; b. a plurality of bottom channels being configured as blind holes and extending from the bottom side of the midsole towards the top side of the midsole; wherein the top channels and the bottom channels are offset to each other.

[0060] Such embodiments allow to provide shearing of the top and bottom channels, which leads ultimately to elastic deformation and closure under the forces occurring during running. During push off, the midsole elastically returns to its original shape which leads to opening of the top and bottom channels and thus to a forward propulsion, which leads to a more efficient energy transmission. The top and bottom channels synergistically act together and significantly enhance this effect. Further, since the channels are configured as blind holes, a stable stand is achieved.

[0061] In some embodiments, the top channels extend along a vertical direction, and in particular diagonally, from the top side of the midsole towards the bottom side of the midsole. In certain embodiments, the top channels extend from the top side towards the bottom side diagonally in the direction of the heel edge of the midsole. In other words, the top channels extend along an oblique axis which intersects the top side of the midsole at a position closer to the midsole tip than the position at which it intersects the bottom side of the midsole. In certain embodiments, each top channel has a top opening on the top side and extends from this top opening in the direction of the heel edge.

[0062] In some embodiments, the bottom channels extend along a vertical direction, and in particular diagonally, from the bottom side of the midsole towards the top side of the midsole. In certain embodiments, the bottom channels extend from the bottom side towards the top side diagonally in the direction of the midsole tip. In other words, the bottom channels extend along an oblique axis which intersects the bottom side of the midsole at a position closer to the heel edge than the position at which it intersects the top side of the midsole. In certain embodiments, each bottom channel has a bottom opening on the bottom side and extends from this bottom opening in the direction of the midsole tip.

[0063] In some embodiments, the top channels and the bottom channels extend in parallel to each other.

[0064] In some embodiments each top channel comprises a top opening, which opens towards the top side. In particular, the top opening may be the only opening of each top channel. In certain embodiments, each top channel may, with the exception of the top opening which opens only to the top side, be completely delimited by the midsole. In particular embodiments, each top channel may not open and therefore be closed towards the lateral side and the medial side of the midsole.

[0065] In some embodiments each bottom channel comprises a bottom opening, which opens towards the bottom side. In particular, the bottom opening may be the only opening of each bottom channel. In certain embodiments, each bottom channel may, with the exception of the bottom opening which opens only to the bottom side, be completely delimited by the midsole. In particular embodiments, each bottom channel may not open and therefore be closed towards the lateral side and the medial side of the midsole.

[0066] In some embodiments, the top and bottom channels may have the shape of a prism, in particular an oblique prism. The prism may in particular have a circular, elliptic, triangular, rectangular, pentagonal or hexagonal base.

[0067] In some embodiments, the width of the top and bottom channel, i.e. its extension in the transverse direction may be less than 80%, in particular less than 60%, in particular less than 50%, in particular less than 40%, in particular less than 25%, of the total width of the midsole at the longitudinal position of the corresponding top and bottom channel.

[0068] In some embodiments, the top channels and the bottom channels are interdigitated with each other in a middle interdigitated area of the midsole. It is understood that such a middle interdigitated area is arranged in a certain area between the top side and the bottom side of the midsole. The middle interdigitated area may typically extend in some embodiments longitudinally, i.e. in the longitudinal direction. The top and bottom channels being interdigitated with each other in such a middle interdigitated area extend typically mainly or fully in the vertical direction of the midsole. This is for example in contrast to the medial and lateral channels described herein being interdigitated in a centrally arranged (central= interdigitated area, where the medial and lateral channels extend typically mainly or fully in the transverse direction of the midsole.

[0069] In some embodiments, the midsole comprises a top layer area. The top layer area may be a particular type of a first rim area. Only top channels extend through, respectively are arranged in, such a top layer area. In some embodiments, the midsole comprises a bottom layer area. The bottom layer area may be a particular type of a second rim area. Only bottom channels extend through, respectively are arranged in, the bottom layer area. In certain embodiments, the middle interdigitated area is sandwiched between the top layer area and the bottom layer area.

[0070] In some embodiments, the midsole comprises or consists of a polymer foam. Suitable polymer foam materials may be polyesters, polyamides, polyolefins, polyurethanes or polyether block amide (PEBA).

[0071] In some embodiments, the total open area defined by the lateral openings is smaller than the total closed area of the lateral side. In particular, the total open area defined by the lateral openings is 30% to 150%, in particular 40% to 100%, more particular 40% to 80%, of the total closed area of the lateral side.

[0072] In some embodiments, the total open area defined by the medial openings is smaller than the total closed area of the medial side. In particular, the total open area defined by the medial openings is 30% to 150%, in particular 40% to 100%, more particular 40% to 80% of the total closed area of the medial side. In some embodiments, the bottom side of the midsole is continuously closed and / or free of channels, in particular through holes, e.g. vertically extending through holes.

[0073] In some embodiments, the volume of the midsole, i.e. the midsole material, such as the polymer foam, is larger than the total channel volume. The total channel volume is the sum of the volumes defined by each first and second channel. The volume of the midsole material does not include the total channel volume.

[0074] In some embodiments, the midsole comprises a forefoot area, a heel area and a midfoot area being arranged between the forefoot area and the heel area and the plurality of first channels and the plurality of second channels are distributed over, respectively arranged in, the heel area, the midfoot area and the forefoot area.

[0075] In some embodiments, the midsole is made from a single-piece. Preferably, the midsole may be foam-molded, in particular injection foam molded.

[0076] In some embodiments, the sole unit comprises a midsole according to any of the embodiments as described herein and further an outsole and / or and insole and / or a rigid plate. The outsole is typically arranged on the bottom side of the midsole. Further, the rigid plate is a plate element which is more rigid than the midsole and which is in itself preferably incompressible and elastic. The rigid plate may for example be arranged on the top side of the midsole.

[0077] In some embodiments, the shoe comprises a midsole according to any of the embodiments herein and an upper.

[0078] Brief description of the figures

[0079] The herein described invention will be more fully understood from the detailed description given herein below and the accompanying drawings which should not be considered limiting to the invention described in the appended claims. The drawings are showing: Fig. 1 a schematic top view on a midsole according to an embodiment of the invention;

[0080] Fig. 2 a schematic medial side view on a midsole according to another embodiment of the invention;

[0081] Fig. 3 a schematic perspective view on a midsole according to another embodiment of the invention;

[0082] Fig. 4 a schematic top side view on a midsole according to another embodiment of the invention;

[0083] Fig. 5 a schematic cross-sectional view on a shoe with a midsole according to another embodiment of the invention.

[0084] Exemplary embodiments

[0085] Fig. 1 shows a schematic top view on top side 14 of a midsole 1 according to the invention. Midsole 1 comprises a plurality of channels which are not directly visible from top side 14, since the channels are in cross section along longitudinal direction L and perpendicular to transverse direction T completely delimited by midsole 1. However, for a better understanding, the channels are indicated by dashed lines. Midsole 1 comprises a plurality of first channels 2a, 2b and 2c (only three of them are referenced for clarity purposes), which are configured as blind holes and are in this embodiment medial channels. First channels 2a, 2b and 2c are characterized by the fact that they extend from a first side, in this case medial side 4, towards an oppositely thereto arranged second side, in this case lateral side 5 and that they open towards the outer environment on medial side 4. However, as can be seen the first channels do not extend up to the second side of the midsole but have a channel end being spaced apart from the second side. In addition, midsole 1 comprises a plurality of another type of channels, namely second channels 3a, 3b and 3c (again, only three of them are referenced for clarity purposes), which are in this embodiment lateral channels. Second channels 3a, 3b and 3c are configured as blind holes and extend in an opposite manner than first channels 2a, 2b and 2c. As can be seen, second channels 3a, 3b and 3c extend from the second side, in this embodiment lateral side 5, in the direction of, i.e. towards, the oppositely arranged first side, in this embodiment medial side 4. Further, the first and second channels are offset to each other along longitudinal direction L. Thus, when travelling from heel edge 7 of midsole 1 along longitudinal direction L to midsole tip 6, the channels do not overlap, respectively are not aligned with each other. This allows to provide an improved cushioning, which can be evenly distributed over the midsole due to the offsetting and provides concomitantly a stable stand. Further, first and second channels are fully alternatingly arranged. When travelling along longitudinal direction L starting from heel edge 7, there is first a lateral channel, then a medial channel, then again a lateral channel, then again a medial channel, and so on. Thus, along longitudinal direction L the first and second channels may be alternatingly arranged. It can further be seen, that first channels 2a, 2b and 2c and second channels 3a, 3b and 3c are interdigitated with each other in centrally arranged interdigitated area 8. Both the first channels and the second channels extend through, respectively are arranged in, interdigitated area 8. When travelling from heel edge 7 along longitudinal direction L to midsole tip 6, one passes both first and second channels in interdigitated area 8. Interdigitated area 8 is arranged between, i.e. sandwiched between medial rim area 10 and lateral rim area 9. The delimitation of interdigitated area 8, lateral rim portion 9 and medial rim portion 10 is indicated by the dotted / dashed lines. In contrast to interdigitated area 8 which is characterized by the fact that at least one first and at least one second channel is arranged therein, the medial rim area (which may in a more general sense be a first rim area) is characterized by the fact that only medial channels (respectively only first channels for a first rim area) is arranged therein. As can be seen, when travelling along longitudinal direction L through medial rim area 10, one passes only first channels, such as 2a, 2b and 2c, but no second channels. Vice versa, the lateral rim area (which may in a more general sense be a second rim area) is characterized by the fact that only lateral channels (respectively only second channels for a second rim area) is arranged therein. As can be seen, when travelling along longitudinal direction L through lateral rim area 9, one passes only second channels, such as 3a, 3b and 3c, but no first channels. If a runner runs with such a midsole, efficient cushioning is achieved in centrally arranged interdigitated area 8, because both first and second channels provide for the cushioning effect. Medial rim area 10 provides also some cushioning, but to a decreased extent, because there are only first (i.e. medial) channels. Thereby, the medial rim portion (and vice versa the lateral rim portion) are more stable and a peripheral rim results which circumferentially surrounds the centrally arranged interdigitated area 8 which provides an increased cushioning. The peripheral rim however prevents unwanted supination or pronation and thereby prevents injuries.

[0086] Fig. 2 shows a side view on medial side 4 of a midsole 1 according to an embodiment of the invention. As it is the case for the midsole being shown in Fig.1 , midsole 1 depicted in Fig. 2 comprises a plurality of first channels, in this case medial channel, 2a, 2b and 2c (again, only three of them are referenced for clarity purposes). Each medial channel is configured as a blind hole and extends from a medial opening on the medial side (see 16a, 16b, 16c) towards the oppositely arranged lateral side in the back of the figure. Midsole 1 also comprises a plurality of second channels, in this case lateral channels, which are configured as blind holes extending from a corresponding lateral opening on the lateral side of the midsole towards the medial side of the midsole. Since the second channels are not visible, they are indicated by dashed lines. It can be seen that along longitudinal direction L, the first and second channels are offset to each other along longitudinal direction L and when viewed in transversal direction T, the first channels and the second channels therefore do not face each other or contact each other. It can also be seen that along a cross section along longitudinal direction L and perpendicular to transversal direction T (pointing to the back of the figure), the first and second channels are each completely delimited by the midsole and therefore not open towards top side 14 or bottom side 15.

[0087] Fig. 3 depicts a perspective view of another embodiment of a midsole 1 according to the invention. In this embodiment, the first channels 2a, 2b and 2c (again, only three of them are referenced for clarity purposes) are also medial channels and the second channels 3a, 3b, and 3c (again, only three of them are referenced for clarity purposes) are also lateral channels as it is the case in the embodiment shown in Fig. 1. The medial channels (i.e. first channels 2a, 2b, 2c) do not extend up to the lateral side 5 of the midsole and the lateral channels (i.e. second channels 3a, 3b, 3c) do not extend up to the medial side 4 of the midsole. However, in this embodiment, the first and second channels are slits, which not only have an opening on the medial side, respectively the lateral side 5 of midsole 1 , but are each open towards top side 14 of midsole 1. It can be seen that each slit extends only partially from top side 14 towards bottom side 15 through midsole 1 but not fully. Each slit has a slit height that extends from the bottom limit of each slit (i.e. its end) vertically to the top side of the midsole. Further the slit width distance of opposing channels walls of a slit in the longitudinal direction L. The slits extend diagonally to the top side 14 of midsole 1. For example, it can be seen with reference to channel (respectively slit) 3c that it extends from its channel opening at top side 14 of midsole 1 towards the bottom side 15 but also in the direction of heel edge 7. During running, a runner has a significant forward movement in longitudinal direction L. If the runner steps on the ground, the diagonal inclination of the first and second channels allow a shearing deformation such that opposing channel wall sections come in contact with each other. Due to the elastic nature of the midsole, the midsole returns to its original shape shown in Fig. 3 during push-off, which provides a forward propulsion and supports the runner.

[0088] Fig. 4 shows a top view of a midsole 1 according to an embodiment of the invention, for example such as a midsole shown and discussed with reference to Fig. 3. Midsole 1 comprises besides certain alternating sections also a non-alternating section in which only first channels are arranged. For example, the section between first channel 2a and first channel 2b is such a non-alternating section, because along longitudinal direction L there are at least 2 (in this particular embodiment 3) directly adjacent channels of the first type, i.e. first channels. In this embodiment, certain aspects of interdigitated area 8 are shown. As has been already described above with reference to Fig. 1 , midsole 1 comprises interdigitated area 8 in which first and second channels are interdigitated with each other. Interdigitated area 8 is along transverse direction T arranged between lateral rim area 9 and medial rim area 10. As it has been already described above with respect to Fig. 1 both the first channels and the second channels extend through, respectively are arranged in, interdigitated area 8. When travelling from heel edge 7 along longitudinal direction L to midsole tip 6, one passes both first and second channels in interdigitated area 8. Interdigitated area 8 is arranged between, i.e. sandwiched between medial rim area 10 and lateral rim area 9. The delimitation of interdigitated area 8, lateral rim portion 9 and medial rim portion 10 is indicated by the dashed lines. In contrast to interdigitated area 8 which is characterized by the fact that at least one first and at least one second channel is arranged therein, the medial rim area (which may in a more general sense be a first rim area) is characterized by the fact that only medial channels (respectively only first channels for a first rim area) are arranged therein. As can be seen, when travelling along longitudinal direction L through medial rim area 10, one passes only first channels, such as 2a, 2b and 2c, but no second channels. Vice versa, the lateral rim area (which may in a more general sense be a second rim area) is characterized by the fact that only lateral channels (respectively only second channels for a second rim area) are arranged therein. As can be seen, when travelling along longitudinal direction L through lateral rim area 9, one passes only second channels, such as 3a, 3b and 3c, but no first channels. It can further be seen that interdigitated area 8 has a curved shape. This curved shape comprises front vertex 11 which is arranged by a distance a away from midsole tip 6. Distance a may for example be 10% to 35% of the total length of midsole 1 (being the distance of the two parallel vertical dashed lines contacting heel edge 7 and midsole tip 6. Further. The curved shape comprises rear vertex 12 which is arranged by a distance b away from heel edge 7. Distance b may for example be 15% to 50% of the total length of midsole 1. It can be seen that the curved shape extends only in a lateral to medial direction starting from rear apex 12 to front apex 11. This means, the curved shape runs between lateral side 5 and medial side 4 of midsole 1 and in fact from the lateral side towards the medial side. The curved shape of interdigitated area 8 further comprises inflection point 13 at which the curved shape changes from a right-handed curve (clockwise) to a left-handed curve (counter-clockwise). Inflection point 13 is arranged between rear vertex 12 and front vertex 11. An interdigitated area having such a shape follows the anatomical prerequisites of the human foot. It strikes an ideal balance between cushioning and stability as the cushioning is provided at the location where it is required the most during running, while other regions, such as the medial and lateral rim portions 9 and 10 provide certain cushioning but also improved stability. Fig. 5 shows a shoe 21 with sole unit 20 having a midsole 1 according to a different embodiment of the invention. In this embodiment, the first and second channels are not medial and lateral channels as it was the case in the embodiments shown in Fig. 1 to 4, but the first channels 2a, 2b, 2c (again, only three of them are referenced for clarity purposes) are top channels which are configured as blind holes extending from top side 14 of midsole 1 towards bottom side 15. It can be seen that the top channels extend diagonally. For example, top channels 2c extends along oblique axis A which intersects the bottom side 15 of midsole 1 at a position closer to the heel edge than the position at which axis A intersects top side 14 of midsole 1. However, since the top channels are blind holes, they do not completely penetrate the midsole and thus do not extend up to the bottom side. Vice versa, second channels 3a, 3b and 3c (again, only three of them are referenced for clarity purposes) are bottom channels being configured as blind holes extending from bottom side 15 of midsole 1 towards top side 14. Also in this embodiment, the first and second channels are alternatingly arranged and further interdigitated with each other, thereby forming middle interdigitated area 17. Middle interdigitated area 17 is sandwiched and thus arranged between top layer area 18 and bottom layer area 19. The delimitation between middle interdigitated area 17, top layer area 18 and bottom layer area 19 is indicated by the dashed lines. The top layer area can generally be seen as a particular type of a first rim area and the bottom layer area as a particular type of a second rim area. Again, also in this embodiment, the middle interdigitated area is characterized by the fact that at least one top channel and at least one bottom channels are arranged therein. In contrast only top channels extend through, respectively are arranged in, top layer area 18. Vice versa, only bottom channels extend through, respectively are arranged in, bottom layer area 19. Sole unit 1 further comprises rigid plate 23 being arranged directly on top side 14 of midsole 1 and outsole 24 being arranged directly below bottom side 15 of midsole 1 . Further, shoe 21 comprises an upper 22 which provides together with sole unit 20 a foot accommodation compartment for accommodating a foot of a runner.

[0089] List of designations

[0090] 1 midsole a-c first channels a-c second channels medial side lateral side midsole tip

[0091] 7 heel edge

[0092] 8 centrally arranged interdigitated area

[0093] 9 lateral rim area

[0094] 10 medial rim area

[0095] 11 front vertex

[0096] 12 rear vertex

[0097] 13 inflection point

[0098] 14 top side

[0099] 15 bottom side

[0100] 16a-c medial openings

[0101] 17 middle interdigitated area

[0102] 18 top layer area

[0103] 19 bottom layer area

[0104] 20 sole unit

[0105] 21 shoe

[0106] 22 upper

[0107] 23 rigid plate

[0108] 24 outsole

[0109] FA forefoot area

[0110] MF midfoot area

[0111] HA heel area

Claims

Claims1. A midsole (1) for a shoe, the midsole (1) comprising: a. a plurality of first channels (2a, 2b, 2c) extending from a first side of the midsole (1) in the direction of a second side of the midsole (1), wherein the second side of the midsole (1) is oppositely arranged to the first side of the midsole (1), wherein the first channels (2a, 2b, 2c) do not extend up to the second side of the midsole (1); b. a plurality of second channels (3a, 3b, 3c) being different from the first channels (2a, 2b, 2c), wherein the second channels (3a, 3b, 3c) extend from the second side of the midsole (1) in the direction of the first side of the midsole (1), wherein the second channels (3a, 3b, 3c) do not extend up to the first side of the midsole (1); wherein the first channels (2a, 2b, 2c) and the second channels (3a, 3b, 3c) are offset to each other.

2. The midsole according to claim 1 , wherein the first channels (2a, 2b, 2c) and the second channels (3a, 3b, 3c) are configured as blind holes.

3. The midsole (1) according to claim 1 or 2, wherein at least some of the first channels (2a, 2b, 2c) and of the second channels (3a, 3b, 3c) are along a longitudinal direction (L) offset to each other.

4. The midsole (1) according to any of the previous claims, wherein the first channels (3a, 3b, 3c) and the second channels (2a, 2b, 2c) are alternatingly arranged.

5. The midsole (1) according to any of the previous claims, wherein the first channels (2a, 2b, 2c) are medial channels extending from a medial side (4) of the midsole (1) in the direction of a lateral side (5) of the midsole (1), wherein the medial channels donot extend up to the lateral side of the midsole (1); and wherein the second channels (3a, 3b, 3c) are lateral channels extending from the lateral side (5) of the midsole (1) in the direction of the medial side (4) of the midsole (1), wherein the lateral channels do not extend up to the medial side of the midsole (1).

6. The midsole (1) according to claim 5, wherein the lateral channels extend along a transverse direction (T) of the midsole (1) from the lateral side (5) of the midsole (1) towards the medial side (4) of the midsole (1); and / or wherein the medial channels extend along the transverse direction (T) of the midsole (1) from the medial side (4) of the midsole (1) towards the lateral side (5) of the midsole (1).

7. The midsole (1) according to claim 5 or 6, wherein the medial channels and the lateral channels are interdigitated with each other in a centrally arranged interdigitated area (8) of the midsole (1).

8. The midsole (1) according to any of claim 7, wherein the midsole (1) comprises a lateral rim area (9) being arranged between the lateral side (5) of the midsole (1) and the interdigitated area (8) of the midsole (1), wherein only the lateral channels extend through the lateral rim area (9).

9. The midsole (1) according to any of claims 7 or 8, wherein the midsole (1) comprises a medial rim area (10) being arranged between the medial side (4) of the midsole (1) and the interdigitated area (8) of the midsole (1), wherein only the medial channels extend through the medial rim area (10).

10. The midsole (1) according to any of claims 7 to 9, wherein the interdigitated area (8) follows the main joints of the human foot.

11. The midsole (1) according to any of claims 7 to 10, wherein the interdigitated area (8) has a curved shape, in particular a curved shape being curved over 80% to 100% of its length.

12. The midsole (1) according to claim 11, wherein the curved shape comprises a front vertex (11) and rear vertex (12).

13. The midsole (1) according to claim 12 wherein the curved shape extends between the rear vertex (11) and the front vertex (12) in a lateral to medial direction.

14. The midsole (1) according to claim 12 or 13, wherein the front vertex (11) is arranged at a distance of 10% to 35% of the total length of the midsole from a midsole tip (6).

15. The midsole (1) according to any of claims 12 to 14, wherein the rear vertex (12) is arranged at a distance of 15% to 50% of the total length of the midsole (1) from the heel edge (7) of the midsole (1).

16. The midsole (1) according to any of claims 12 to 15, wherein the curved shape comprises an inflection point (13) between the front vertex (11) and the rear vertex (12), wherein the inflection point (13) is arranged at 45% to 65% of the total length of the midsole (1) from the heel edge (7) of the midsole (1).

17. The midsole (1) according to any of claims 5 to 16, wherein the lateral channels and / or the medial channels are slits being open towards a top side of the midsole (1).

18. The midsole (1) according to claim 17, wherein the slits extend from the top side (14) of the midsole (1) only partially towards a bottom side (15) of the midsole (1).

19. The midsole (1) according to claim 17 or 18, wherein the slits extend in a direction from the top side (14) of the midsole (1) towards the bottom side (15) of the midsole (1) diagonally towards the heel edge (7).

20. The midsole (1) according to any of claims 5 to 19, wherein the lateral channels and / or the medial channels are in cross section along the longitudinal direction (L) and perpendicular to the transverse direction (T) of the midsole completely delimited by the midsole (1).

21. The midsole according to any of claims 6 to 20, wherein the medial channels comprise medial openings (16a, 16b, 16c) on the medial side (4) of the midsole (1) and wherein the lateral channels comprise lateral openings on the lateral side (5) of the midsole (1).

22. The midsole (1) according to claim 21 , wherein the midsole (1) is configured such that the medial openings (16a, 16b, 16c) and / or the lateral openings are horizontally and / or vertically deformed, in particular sheared, under the forces occurring during running such that they close completely.

23. The midsole (1) according to any of claims 1 to 4, wherein the first channels (2a, 2b, 2c) are top channels being configured as blind holes and extending from a top side (14) of the midsole (1) towards a bottom side (15) of the midsole (1); and wherein the second channels (3a, 43b, 3c) are bottom channels being configured as blind holes and extending from the bottom side (15) of the midsole (1) towards the top side (14) of the midsole (1).

24. The midsole (1) according to claim 23, wherein the top channels extend along a vertical direction (V), and in particular diagonally, from the top side (14) of the midsole (1) towards the bottom side (15) of the midsole (1); and / or wherein the bottom channels extend along a vertical direction (V), and in particular diagonally, from the bottom side (15) of the midsole (1) towards the top side (14) of the midsole (1).

25. The midsole (1) according to claim 23 or 24, wherein the top channels and the bottom channels are interdigitated with each other in a middle interdigitated area (17) of the midsole (1).

26. The midsole (1) according to claim 25, wherein the midsole (1) comprises a top layer area (18) and a bottom layer area (19), wherein the middle interdigitated area (17) is sandwiched between the top layer area (18) and the bottom layer area (19), whereinonly the top channels extend through the top layer area (18) and / or only the bottom channels extend through the bottom layer area (19).

27. The midsole (1) according to any of the previous claims, wherein the midsole (1) comprises or consists of a polymer foam.

28. The midsole (1) according to any of the previous claims, wherein the midsole (1) comprises a forefoot area, a heel area and a midfoot area being arranged between the forefoot area and the heel area, wherein the plurality of first channels (2a, 2b, 2c) and the plurality of second channels (3a, 3b, 3c) are distributed over the heel area, the midfoot area and the forefoot area.

29. Sole unit (20) comprising midsole (1) according to any of the previous claims.

30. Shoe (21) comprising the midsole (1) according to any of claims 1 to 28.

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