SKI BOOT WITH LINER

Description

Technical field of the invention

[0001] The disclosure relates to a liner designed to be inserted into the lower shell of a ski boot, the liner being formed of a lower part adapted to enclose a foot and an upper part adapted to enclose a shin. The invention relates to a ski boot comprising such a liner and a lower shell. State of the art

[0002] A ski boot requires significant rigidity as the intermediary between the skier and the ski. For this purpose, ski boots generally have a rigid shell. The shell consists of a lower section that wraps around the foot and a cuff that wraps around the lower leg. The lower section and the cuff are usually held together by a hinge around a transverse axis passing through the ankle. The cuff is locked onto the lower section while skiing to allow for optimal power transmission from the skier, thus enabling precise ski control. A comfort liner is fitted inside the rigid shell to increase the skier's comfort while providing thermal insulation. Generally, the liner, like the shell, is formed with a lower section that wraps around the foot and an upper section that wraps around the lower leg.

[0003] On the other hand, a ski boot must be practical and, in particular, easy to put on. The use of a rigid shell makes inserting the foot into the ski boot difficult, especially due to the thickness of the material (plastic) used to form the shell walls. The user must force their foot into the boot. Alternatively, they must manually deform the cuff forming the upper part of the shell while inserting their foot into the boot.

[0004] Furthermore, the articulation between the lower shell and the cuff at the ankle is locked to ensure proper skiing technique. Indeed, only a small amount of forward movement of the cuff relative to the lower shell is necessary, while no lateral movement of the cuff relative to the shell is possible. In other words, the skier's lower leg must primarily be able to flex forward, but not laterally. This forward movement corresponds to the boot's flex capacity. Because this forward movement is limited, walking in such boots is difficult, increasing the risk of falls. Finally, existing ski boots are heavy.

[0005] Document CH 698108 B describes a ski boot with an inner liner according to the preamble of independent claim 1. Object of the invention

[0006] The aim of the invention is to provide a ski boot that remedies all or part of the disadvantages of the prior art mentioned above, and thus improves known ski boots.

[0007] In particular, a primary objective of the invention is to find a new solution to facilitate the insertion of the foot into a ski boot. Additionally, the invention also relates to optimizing the comfort, weight, and manufacturing cost of a ski boot.

[0008] The invention relates to a ski boot according to the subject matter of independent claim 1. Brief description of the drawings

[0009] These objects, features and advantages of the present invention will be described in detail in the following description of a particular embodiment, given by way of non-limiting example, with reference to the accompanying figures, among which: There figure 1is a schematic front view of a ski boot according to one embodiment of the invention. figure 2 is a profile view of a slipper according to one embodiment of the invention. figure 3 is a profile view of a slipper according to one variant of its construction. figure 4 is a front view of the slipper in its open configuration according to the embodiment of the invention. figure 5 is a front view of the slipper in its closed configuration according to the embodiment of the invention. figure 6 is a view of the back of the slipper according to the embodiment of the invention. figure 7 View from below of the slipper according to the embodiment of the invention. The figure 8 is a view of the lower part of the ski boot shell according to the embodiment of the invention. figure 9 is a side view of a ski boot according to the embodiment of the invention. Figure 10is a rear view of a slipper according to one embodiment of the invention. figure 11 is a side view of a ski boot according to the embodiment of the invention. figure 12 is a rear view of a slipper according to one embodiment of the invention. figure 13 is a profile view of the bottom of a hull according to another embodiment of the invention. figure 14 is a side view of a ski boot incorporating the liner of the figure 12 according to an alternative embodiment of the invention. The figure 15 is a profile view of the bottom of a hull according to another embodiment of the invention. figure 16 is a rear view of a slipper according to this other variant of the figure 15 of the realization of the invention. The figure 17 is a side view of a ski boot according to one embodiment of the invention. Description of preferred modes of the invention

[0010] In the following description, the shoe is assumed to be resting on a horizontal surface. The vertical direction therefore extends from the sole of the shoe to its upper, perpendicular to the horizontal plane. The longitudinal axis X designates a horizontal axis oriented from the back to the front of the shoe. The transverse axis Y designates a horizontal axis perpendicular to both the longitudinal and vertical axes. The terms "upper," "lower," "top," and "bottom" refer to the vertical orientation. The terms "front" and "back" refer to the longitudinal orientation.

[0011] There figure 1Figure 1 illustrates a ski boot according to an embodiment of the invention. According to this embodiment, the ski boot is suitable for alpine skiing; alternatively, the invention can be used for any sliding sport in which ankle movement must be restricted. For example, such a boot can be adapted for ski touring or snowboarding. The ski boot according to the embodiment comprises a lower shell 10 and a liner 20.

[0012] The bottom of the hull 10, particularly visible on the figure 1 and on the figure 8The boot has an overall shape designed to surround a skier's foot. The lower shell 10 is a single piece, meaning it does not comprise several separate parts. Alternatively, the lower shell can be made of several parts, possibly made of different materials. However, these different parts are fixed relative to each other. According to the invention, the lower shell comprises a walking sole 11 and a rigid outer shell 12 surrounding the skier's foot and attached to the sole 11, for example, by screws. The sole 11 can be a single piece or comprise several parts, for example, in the case where the sole is formed of two front and rear heel pieces. The outer shell 12 extends upwards generally to the level of the skier's ankle. Alternatively, the outer shell 12 can extend beyond the skier's ankle. The outer shell 12 includes an opening 13 at the top allowing the foot to be inserted.The boot shell can be made from a single piece. It can be made of plastic and can consist of a partition of generally uniform thickness all around the skier's foot. Alternatively, the boot shell can be made of several materials, possibly with different mechanical properties, such as plastics, and even composite materials with fibers, for example carbon or glass, and a resin, particularly a thermoplastic. The stiffness of the boot shell is a compromise between being rigid enough to transmit the forces from the foot to the ski and ensure proper ski guidance, and flexible enough to allow for a snug fit across the top of the foot.

[0013] Unlike known prior art ski boot shells, the ski boot 1 according to the embodiment of the invention does not include a collar fixed and articulated to the bottom of the shell and extending upwards around the tibia or lower leg.

[0014] The opening 13 can be extended forward by a slit 14 running longitudinally along the top of the foot. This slit 14 enlarges the opening 13, facilitating foot insertion. The slit 14 can be delimited by two flaps 15a, 15b, one of which passes over the other, as shown in the figure 1Thus, at slot 14, two wall thicknesses can overlap, which notably improves the watertightness of the lower shell 10. The lower shell may include a tightening means 16 to secure the skier's foot within the lower shell. The tightening means 16 is generally formed of one or more loops, comprising, for example, on one side of the lower shell, a lever connected to a stirrup, designed to cooperate with a toothed piece, located on the other side of the lower shell.

[0015] The sole 11 is extended at both its front and rear ends by sidewalls 17a, 17b, shaped to accommodate the jaws of a ski boot binding. The sole 11 can be a single piece with the upper 12, or it can be a separate piece attached to the upper 12. The height of the sidewalls 17a, 17b and the overall shape of the sole 11 are standardized to ensure compatibility with standard binding jaws. The sole 11 and the sidewalls 17a, 17b are considered rigid compared to the other parts of the ski boot. In alpine skiing, when the boot is engaged in the binding jaws, the sole extends in a plane substantially parallel to the plane of the ski. The lower part of the shell is then firmly attached to the ski.

[0016] The slipper 20 is notably illustrated on the figures 2 to 7It comprises a lower part 22 adapted to enclose the skier's foot, and an upper part 23 adapted to at least partially enclose a shin, that is, a portion of the lower leg located above the ankle. The liner is generally L-shaped. The lower part 22 extends longitudinally, and the upper part 23 extends vertically. The lower part 22 of the liner 20 is adapted to be inserted into the lower shell 10, while the upper part 23 remains at least above the lower shell 10. The lower shell may extend beyond a lower section of the upper part 23 of the liner. Preferably, the liner extends above the lower shell by a height greater than one-third of its total height. For example, for a liner thirty centimeters high, the liner extends above the lower shell by more than ten centimeters.

[0017] The liner 20 is designed to be in contact with the skier's foot and lower leg. The liner may consist of several layers. The inner layers of the liner are generally made of a soft material. The liner may include a first comfort underlayer whose main function is to ensure comfortable contact with the skier's foot and lower leg. It may also include a second padding underlayer whose function is to thermally insulate the foot from the outside while distributing the ski boot's tightening pressure over a sufficiently large area of ​​the foot and lower leg to avoid creating painful pressure points for the skier. This second padding underlayer may optionally be heat-moldable to ensure a better fit of the liner to the user's morphology. The liner also includes a front tongue 24, visible on the figure 4The tongue 24 is arranged vertically in a front opening 25 of the upper part 23 of the liner 20. It is generally attached near the front of the lower part 22 of the liner 20. The tongue 24 can be tilted forward to enlarge the opening 25 of the liner and facilitate insertion of a foot into the liner. Furthermore, the rigidity of the tongue 24 of the liner 20 plays an important role in controlling the forward flex of the entire ski boot.

[0018] The liner 20 further comprises an outer layer 30 that is stiffer than the inner layers of the liner 20. The outer layer is generally shaped like a vertically oriented cylinder. It is attached to the upper part 23 of the liner and encloses this upper part 23. Alternatively, the outer layer could only partially enclose the upper part 23. For example, the outer layer might not extend behind the leg at the lower calf. Such a configuration would then reduce the stiffness of the resulting ski boot while remaining sufficient to guide the ski. According to another alternative, the outer layer 30 could extend beyond the upper part 23 of the liner, thereby increasing the stiffness of the ski boot.

[0019] The outer layer comprises two flaps 31a, 31b that can close against each other, defining a front opening 32. This front opening is a forward-facing opening, substantially superimposed on the opening 25 of the upper part 23 and the front tongue 24 of the boot. The outer layer has such flexibility and elasticity that the two flaps 31a, 31b can be separated to free the front opening 32. The two flaps are therefore flexible and mobile, reversibly between two configurations. In the first configuration, called "open," designed to facilitate donning the boot, the two flaps are separated from each other as illustrated in the figure 4 In a second configuration, called "closed", the flap on the inside of the foot covers the flap on the outside of the foot, as illustrated in the figure 5The two flaps 31a and 31b of the outer layer 30 are likely to cover at least partially the upper part of the two flaps 15a and 15b of the bottom of the hull.

[0020] The outer layer 30 takes the form of a plate of substantially uniform thickness. According to one embodiment of the invention, the outer layer has variable thickness; in particular, the outer layer has a greater thickness at its rear than at its front, at the level of the two flaps 31a, 31b. The outer layer can be made of plastic material, in particular thermoformed plastic material. The outer layer can also be made of composite materials based on fibers, for example, glass, carbon, or Kevlar, and a thermoplastic resin. In another embodiment, the outer layer could be obtained by a conventional plastic injection molding process. This outer layer is the most rigid of the layers of the upper part 23 of the sock 20.

[0021] According to one embodiment, the outer layer 30 is attached by at least one seam 33 to the upper part 23 of the slipper. The seam 33 is illustrated by a dotted line visible on the figures 2, 3 , 6 , 9 and 10 It extends from one side of the shoe to the other, passing over the back. The outer layer 30 is therefore attached to the shoe for approximately three-quarters of a turn. Furthermore, the outer layer is not attached at the front, where its flaps 31a, 31b are free. Alternatively, the outer layer 30 could be attached to the shoe at its upper end by any other means. For example, it could be glued, riveted, or welded.

[0022] According to an embodiment particularly visible on the figure 2The outer layer 30 is attached to the upper part of the slipper by two substantially parallel seams 33a, 33b, positioned substantially one above the other. A second, lower seam 33b reinforces the connection between the outer layer 30 and the slipper. This second seam 33b is positioned below seam 33a. It can alternatively have any shape, as shown in the various embodiments illustrated in the diagrams. figures 2, 3 , 6 , 9 and 10 This second seam 33b increases the surface area of ​​the outer layer 30 attached to the slipper. The second seam 33b can also contribute to a retention function of the upper part of the slipper, as will be detailed later.

[0023] The outer layer 30 is attached to the upper part of the slipper. That is to say, the attachment points of the outer layer (i.e., for example, the stitching points) are distributed in an upper part 38a of the outer layer 30, while the lower part 38b of the outer layer 30 is not attached to the slipper. As can be seen on the Figures 14 And 17The lower part of the liner is positioned inside the lower shell 10. The upper part of the lower shell is positioned between the inner layers of the liner 20 and the lower part 38b of the outer layer 30. In other words, the outer layer 30 covers the upper part of the lower shell 10. In this embodiment, the outer layer 30 thus covers the outer surface of the upper part of the lower shell, acting as a skirt. Therefore, the outer layer 30 covers, by its inner face, the outer face of the upper part of the lower shell 10. This configuration provides a seal, preventing water or snow from penetrating the lower shell 10. This configuration also allows the outer layer to act as a retaining element for the upper part of the liner, as will be detailed later.

[0024] The shoe 20 also includes a closure means 34 for the upper part, allowing the two flaps 31a, 31b to be held in the closed position. This closure means may include, in particular, at least one toggle (buckle + lever cooperating with a buckle) and / or a strap with a hook and loop fastener and / or a lace. As shown on the Figures 1 And 5 , the closing means of the illustrated embodiment is formed by a toggle (loop + lever cooperating with a tooth) surmounted by a strap equipped with a hook and loop fastener.

[0025] Furthermore, since the two flaps 31a and 31b of the outer layer 30 can at least partially cover the upper part of the two flaps 15a and 15b of the lower shell, the closure means 34, in its closed configuration, contributes to retaining the liner 20 in the lower shell. The closure means 34 tightens the flaps 15a and 15b of the lower shell against the liner.

[0026] The outer layer 30 also includes a means for retaining the liner, specifically for retaining its upper part relative to its lower part and to the bottom of the shell when the liner is inserted into the bottom of the shell. This retention means allows the upper part 23 of the liner 20 to be rotationally locked relative to the bottom of the shell 10 around at least one axis of rotation. The liner is advantageously retained in several directions within the bottom of the shell. In particular, it is beneficial to lock the upper part 23 of the liner 20 in rearward rotation relative to the bottom of the shell 10 around the transverse axis Y passing through the ankle, to optimize the transmission of forces exerted by the skier's foot and / or leg on the ski. Additionally, it is also beneficial to lock the upper part 23 of the liner 20 in rotation relative to the bottom of the shell 10 around the longitudinal axis X.The retention mechanism is formed in part by the overlap of the lower part 38b of the outer layer 30 of the liner onto the lower shell. This overlap creates bearing and / or stop surfaces for this lower part 38b on the lower shell, which limits, or even blocks, the relative movement of the upper part of the liner with respect to the lower shell, and therefore also with respect to the lower part of the liner.

[0027] In particular, the restraint means may include a rigid stop, capable of bearing against the bottom of the hull 10.

[0028] According to the embodiment illustrated on the figure 1The retention mechanism consists of a lower front edge 37a of at least one of the two flaps 31a, 31b. When the boot is flexed forward, the lower front edge 37a abuts against an upper part of the lower shell, specifically against the two flaps 15a, 15b. The rigidity of the outer layer 30 is then sufficient to limit the forward flexing movement. Advantageously, the lower front edge 37a can be locally reinforced to prevent any deformation that would compromise the boot's rigidity.

[0029] A slight forward movement is necessary for proper ski boot function. The only movement required for effective skiing is the forward flex of the upper part of the ski boot relative to the lower part. Although this flex is minimal, the ski boot, once closed, must flex forward. The stiffness of a ski boot's upper and its forward flex capacity depend on the intended skiing style. A beginner's ski boot should be relatively flexible to provide greater comfort. Conversely, a stiffer boot will allow for better power transmission from the skier to the skis, thus improving performance.

[0030] In the case of the invention, the boot can flex forward, notably due to the relative flexibility of the liner compared to the lower shell. The embodiment of the invention includes defining a good compromise between the rigidity of the lower shell 10 and the outer layer 30, and the flexibility of the liner. The retention means thus represents a limitation on the forward rotation of the upper part of the liner, defined according to the specific needs of a given skier.

[0031] According to this embodiment, the lower part of the rigid outer layer 30 covers the upper part of the lower shell almost entirely around its perimeter, like a skirt, as previously described. This design provides a retention mechanism, since rotation of the upper part 23 of the liner, around any axis, causes this skirt to press against the lower shell and prevents further rotation. Additionally, this arrangement indirectly retains the liner within the lower shell. Thus, in this embodiment, the stop mechanism extends over virtually the entire perimeter of the lower shell and limits / prevents any rotation of the upper part 23 of the liner, particularly around the two longitudinal axes X and Y. The retention or blocking of the upper part 23 of the liner is therefore achieved through reciprocal support between the skirt and the lower shell.In particular, this support is obtained by the free areas in the lower part of the outer layer 30 of the boot liner, that is to say the areas not attached to the boot liner, which cover the bottom of the shell.

[0032] This support comprises substantially vertical surfaces, formed respectively by the inner surface of the boot skirt and the outer surface of the lower shell. In addition, one or more ends of this skirt and / or the lower shell may form additional support or abutment surfaces. Specifically, the lower end of the skirt, i.e., its lower edge, may bear against the lower shell, as illustrated by the frontal edge 37a. This support may simply be against the surface of the lower shell, or against a specific element arranged on this lower shell, such as a tab 19 as represented by the figure 17. In addition, the second seam 33b of the outer layer 30 on the boot can form a closed surface against which the upper edge of the lower shell butts.

[0033] In addition, the lower hull may also include a retaining device (not shown) such as a bead or collar to prevent, or at least limit, deformation or displacement of the outer layer 30 at the lower front edge. Note that rotation about a longitudinal axis is blocked by lateral supports 37b.

[0034] In an alternative embodiment, the retention means can be obtained differently, for example via a bead 39, formed in the outer layer 30, for example by thermoforming, as illustrated in the Figures 10 And 11The top of the lower shell can rest against the ridge 39 of the outer layer, thus facilitating the retention of the liner relative to the lower shell. Such a ridge 39 can therefore behave like the seam mentioned above, which is then unnecessary as a means of retention.

[0035] As an alternative embodiment, the retention mechanism can be achieved differently. In particular, it can consist of several distinct retention zones, not continuously distributed across the shoe. It can also incorporate different geometries.

[0036] Thus, according to a first variant of the embodiment, illustrated by the figures 13 to 16The retention means includes an opening 36 in the outer layer 30 adapted to cooperate with a projection 18 formed at the rear of the lower shell 10. The shape of the opening may be arbitrary but must nevertheless conform to the shape of the projection. For example, the opening may be polygonal, such as a square or a rhombus, but may also be round. Similarly, the shape of the projection may be arbitrary but must at least partially conform to the shape of the opening. The latter may include a stud fixed to the lower shell, for example by means of a screw. When the stud coincides with the opening, the outer layer 30, as well as the upper part 23 of the boot, are immobilized relative to the lower shell. Alternatively, the retention means could be reversed, i.e., the projection would be integral with the outer layer 30 and would cooperate with an opening of complementary shape formed in the lower shell 10.Alternatively, the retention means could comprise a first projection attached to the outer layer 30 and a second projection attached to the bottom of the shell, these two projections being able to abut against each other. Note that the retention means can be arranged on the outer layer 30 or directly on the inner layers of the upper part 23 of the boot 20.

[0037] With reference to the figure 17The retention means may comprise one or two tabs 19, each fixed, for example, by means of two screws 19a, to the side of the lower shell. These two tabs 19 form stops for the lower lateral edges 37b of the outer layer 30. Alternatively, the tabs 19 could also be fixed to the liner or to the outer layer and cooperate with an upper edge of the lower shell. This configuration is suitable for preventing the upper part 23 of the liner 20 from rotating relative to the lower shell 10 about the longitudinal axis X.

[0038] Ultimately, it appears that the means of retaining the slipper can include various characteristics, which can be combined with each other, including: A simple bearing surface, forming a friction or stop surface limiting or blocking a certain movement; A seam forming a stop surface; An edge or rim forming a bearing or stop surface; A stud forming a stop; Lateral fins forming a stop.

[0039] Note that the lower shell 10 and the liner 20 can be separated. The liner can be removed from the lower shell, for example, to facilitate drying. The liner can also be fitted with a walking sole. Therefore, when the user is not skiing, they can remove the lower shell for even more comfortable walking.

[0040] When the user wants to put on their ski boot, they ensure that the tightening means 16 on the lower shell and the closure means 34 on the liner are loosened. Then they separate the two flaps 31a and 31b of the outer layer 30 and lower the front tab 24, which will also separate the flaps 15a and 15b of the lower shell. The skier then benefits from a wide opening forward and upward to insert their foot. They can then tighten the tightening and closure means 16 and 34. If the user wants to walk in their ski boot, they can leave the closure means 34 of the outer layer open. This will allow for greater ankle mobility, making walking more comfortable. When alpine skiing, the closure means 34 is closed.The skier's tibial pressure is transmitted to the ski via the liner's tongue and the outer layer against the lower shell. Specifically, the ankle joint is secured by the outer layer's retention mechanism against the lower shell. In other words, the boot resists pivoting, particularly backward and along a longitudinal axis of rotation, from right to left and vice versa, of the user's lower leg. As an advantageous alternative, this pivoting is also limited in one or more other directions, notably forward. This allows the skier to properly control the trajectory of their skis.

[0041] Thanks to the invention, a ski boot that is easy to put on is available. Furthermore, the boot is particularly lightweight compared to existing boots, as it has no cuff or means of attaching the cuff to the bottom of the shell. It is therefore also easy to manufacture. The invention is advantageously implemented for a ski touring boot where lightness and a wide range of ankle movement during walking are desirable.

[0042] The invention could also be advantageously used for ski boot rentals. It is conceivable to offer different ski boot components equipped with external layers of varying rigidity, all combined with the same lower shell. The ski boot's rigidity can thus be adjusted according to the skier's skill level without having to replace the lower shell. The lower shell can be selected based on other criteria, such as shoe size and / or aesthetics.

[0043] According to another unillustrated embodiment, the means of retaining the liner relative to the bottom of the shell can be retractable: it occupies a first locked configuration for skiing in which it limits or blocks the movement of the upper part of the liner relative to the bottom of the shell, as explained previously, and a second unlocked configuration, in which this limitation or blocking is removed or reduced, at least in one direction, in particular in a rotation around the transverse axis Y, in order to promote walking.

Claims

1. Ski boot (1) comprising a lower shell (10) and a liner (20), the liner (20) being equipped with a lower part (22) adapted to wrap around a foot and an upper part (23) adapted to at least partially wrap around a shin, said lower part (22) being intended to be inserted into the lower shell (10), the liner comprising at least one rigid outer layer (30) fixed to said upper part (23), this outer layer (30) comprising a lower part (38b) covering, by its inner face, the outer surface of an upper part of the lower shell (10) when the liner is inserted into the lower shell, the outer layer thus presenting itself as a skirt to prevent water or snow from penetrating inside the lower shell 10, the outer layer (30) comprising a liner retention means (20) so as to block and / or limit the rotation of the upper part (23) relative to the lower part (22) around a transverse axis (Y) when the liner is inserted into the lower shell, the retention means being partly formed by the covering on the lower shell of the lower part (38b) of the outer layer (30) of the liner, characterized in that the retention means comprises at least one front lower edge (37a) of the outer layer forming a stop against an upper part of the lower shell, and in that the ski boot does not comprise a collar fixed and articulated to the lower shell and extending upward around the shin or the lower leg.

2. Ski boot according to the preceding claim, characterized in that the liner retention means (20) is formed on the lower part (38b) of the outer layer (30).

3. Ski boot according to the preceding claim, characterized in that the liner retention means comprises at least two lateral parts on each side of the liner to block rotation along a longitudinal axis of the upper part (23) and at least one rear part to block rearward rota-tion along a transverse axis of the upper part (23).

4. Ski boot (20) according to one of the preceding claims, characterized in that the outer layer (30) comprises a front opening (32) delimited by two flexible flaps (31a, 31b), adapted to close this front opening (32), and comprises a closure means (34) allowing the two flaps (31a, 31b) to be kept closed.

5. Ski boot according to one of the preceding claims, characterized in that the outer layer (30) forms a layer totally or partially surrounding the upper part (23) of the liner and comprising a lower part (38b) having one or more free zones extending downward at the level of the lower part of the liner, these free zones being adapted to at least partially cover the outer surface of the lower shell (10) when the liner is inserted into the lower shell.

6. Ski boot according to one of the preceding claims, characterized in that the outer layer (30) is sewn onto the upper part (23) in its upper part.

7. Ski boot according to one of the preceding claims, characterized in that the retention means comprises all or part of the following characteristics : - a seam of the outer layer (30) on the upper part (23) in its lower part; and / or - at least one bead (39) arranged on the outer layer; and / or - at least one lower end (37a, 37b) of the outer layer forming a stop; and / or - an opening (36) or a projection in the lower part of the outer layer (30) forming a retention means adapted to cooperate with a projection (18) arranged in the lower shell (10) when the liner is inserted into the lower shell.

8. Ski boot according to one of the preceding claims, characterized in that the outer layer (30) is manufactured from plastic material, in particular from injected plastic material.

9. Ski boot (1) according to one of the preceding claims, characterized in that at least one zone of the upper part of the lower shell (10) is inserted between the inner layer and the outer layer (30) of the liner (20).

10. Ski boot (1) according to one of the preceding claims, characterized in that the lower shell (10) comprises at least one stud or a projection in its upper part forming a retention means cooperating with the liner retention means.