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A device for retaining a boot on a board adapted to a sporting activity, and a boot therefor. The device includes a base, a lateral edge, a rear support element, and at least one linkage for holding the boot above the base. The edge and the rear support element each have an inner surface. One or sev

A device for retaining a boot on a board adapted to a sporting activity, and a boot therefor. The device includes a base, a lateral edge, a rear support element, and at least one linkage for holding the boot above the base. The edge and the rear support element each have an inner surface. One or several of the inner surfaces of the device has at least one friction plate that projects at least partially with respect to the inner surface, the fiction plate being provided at least to oppose a movement of the boot in relation to the base.

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1. A device for retaining a boot on a gliding, rolling, or walking board adapted to a sporting activity, the device comprising:a base provided to receive at least partially a sole of the boot; at least one lateral edge connected to the base so as to be opposite at least one lateral portion of the bo

1. A device for retaining a boot on a gliding, rolling, or walking board adapted to a sporting activity, the device comprising:a base provided to receive at least partially a sole of the boot; at least one lateral edge connected to the base so as to be opposite at least one lateral portion of the boot; a rear support element provided to receive an upper of the boot at a rear of a user's lower leg; and at least one linkage for holding the boot above the base; said edge and said rear support element each having an inner surface provided to be opposite the boot, at least one of said inner surfaces having at least one friction plate projecting at least partially with respect to said at least one inner surface, said at least one friction plate having friction means provided at least to oppose a separation of the boot upwardly from said base and to reduce small displacements of the upper of the boot with respect to the device during said sporting activity. 2. A retaining device according to claim 1, wherein:said at least one friction plate comprises a friction plate projecting with respect to the inner surface of the rear support element. 3. A retaining device according to claim 1, wherein:said at least one lateral edge comprises first and second lateral edges connected to the base so as to be opposite lateral portions of the boot; two plates project with respect to an inner surface of the first lateral edge; and two plates project with respect to an inner surface of the second lateral edge. 4. A retaining device according to claim 1, wherein:the at least one friction plate is made of fabric. 5. A retaining device according to claim 1 in combination with a flexible boot, wherein:said boot is adapted to a sporting activity and includes: a sole; an upper; and at least one friction plate fixed with respect to and projecting at least partially with respect to a lateral outer portion of the sole and/or with respect to an outer portion of the upper, said at least one friction plate being distinct from a remainder of said boot and having a length less than an entirety of a length of the sole or of the upper of the boot, said at least one friction plate of the boot positioned on the boot for engagement with at least said friction plate of said device. 6. A device according to claim 1, wherein:said friction means comprises a non-smooth boot-contacting surface. 7. A device for retaining a boot on a gliding, rolling, or walking board adapted to a sporting activity, the device comprising:a base provided to receive at least partially a sole of the boot; at least one lateral edge connected to said base so as to be opposite at least one lateral portion of the boot; a rear support element provided to receive a boot upper at a rear of a user's lower leg; and at least one linkage for holding the boot above said base; said edge and said rear support element each having an inner surface provided to be opposite the boot, at least one of said inner surfaces having at least one friction plate projecting at least partially with respect to said at least one inner surface, said at least one friction plate having means for at least opposing a separation of the boot in relation to said base, said means being constituted by an alternation of projections and recesses arranged on a surface of said friction plate. 8. A retaining device according to claim 7, wherein:each said projection is a tooth, and wherein the recesses are grooves. 9. A retaining device according to claim 7, wherein:the teeth and the grooves run over the friction surface, substantially parallel to an upper surface of the base. 10. A device for retaining a boot on a gliding, rolling, or walking board adapted to a sporting activity, the device comprising:a base provided to receive at least partially a sole of the boot; first and second lateral edges connected to said base so as to be opposite lateral portions of the boot and an arch connecting said first and second lateral edges at a rear of said base; a rear support element provided to receive a boot upper at a rear of a user's lower leg; and at least one linkage for holding the boot above said base; at least one of said first and second lateral edges and said rear support element each having an inner surface provided to be opposite the boot, at least one of said inner surfaces having at least one friction plate projecting at least partially with respect to said at least one inner surface, said at least one friction plate having means for at least opposing a separation of the boot in relation to said base, said friction plate has ribs housed in cavities of said first and second lateral edges, said arch, or said rear support element. 11. A flexible boot adapted to a sporting activity, the boot being adapted to be engaged with inner surfaces of a boot retaining device, said boot comprising:a sole; an upper; at least one friction plate fixed with respect to and projecting at least partially with respect to an outer lateral portion of the sole and/or with respect to an outer portion of the upper for contacting one or more of the inner surfaces of the boot retaining device, said friction plate having a top portion and a bottom portion, said top and bottom portions of said friction plate being positioned against the boot; said friction plate comprising fabric. 12. A flexible boot according to claim 11, wherein:said at least one friction plate is/are distinct from a remainder of the boot. 13. A flexible boot according to claim 11, wherein:said friction plate is positioned on the boot for contact with at least one of the following structural elements of the boot retaining device: one of a pair of upwardly extending lateral edges, an arch connecting the pair of upwardly extending lateral edges, and a rear support element extending upwardly relative to the lateral edges. 14. A flexible boot according to claim 11, wherein:said friction plate is constituted of an alternation of projections and recesses. 15. A flexible boot according to claim 14, wherein:said projections are teeth; and said recesses are grooves. 16. A flexible boot according to claim 15, wherein:said teeth and said grooves extend substantially parallel to a lower surface of said sole. 17. A flexible boot according to claim 11, wherein:said friction plate is arranged at a rear of the boot. 18. A flexible boot according to claim 11, wherein:said friction plate is arranged at a side of the boot. 19. A flexible boot according to claim 11, wherein:said at least one friction plate comprises at least one friction plate arranged at a rear of the boot and at least one friction plate arranged at a side of the boot. 20. A device for retaining a boot on a sports board, said device comprising:a base having an upwardly facing surface to support a sole of the boot; at least one lateral edge connected to the base so as to contact at least one lateral portion of the boot; a rear support element to receive an upper of the boot at a rear of a rider's lower leg, said lateral edge and said rear support element each having an inner side provided to be opposite the boot; at least one strap to extend over a portion of the boot to hold the boot on the base; means, secured to and projecting from at least one of said inner sides, for contacting and opposing movement of the boot from said upwardly facing surface of said base and for reducing small displacements of the upper of the boot with respect to the device during use of said sports board. 21. A device according to claim 20, wherein:said means further comprises means for opposing movement of the boot toward said upwardly facing surface of said base with less force than a force opposing movement of the boot from said upwardly facing surface of said base. 22. A device according to claim 20, wherein:said means comprises a non-smooth boot-contacting surface. 23. A device for retaining a boot on a sports board, said device comprising:a base having an upwardly facing surface to support a sole of the boot; at least one lateral edge connected to the base so as to contact at least one lateral portion of the boot; a rear support element to receive an upper of the boot at a rear of a rider's lower leg, said lateral edge and said rear support element each having an inner surface provided to be opposite the boot; at least one strap to extend over a portion of the boot to hold the boot on the base; means, secured to and projecting from at least one of said inner surfaces, for increasing friction with the boot during movement of the boot from said upwardly facing surface of said base, opposing said movement of the boot from said upwardly facing surface of said base and reducing small displacements of the upper of the boot with respect to the device during use of said sports board, said friction generated by said means being increased relative to friction between the boot and said one of said inner surfaces to which said means is secured. 24. A device according to claim 23, wherein:said friction means comprises a non-smooth boot-contacting surface. 25. A device for retaining a boot on a gliding, rolling, or walking board adapted to a sporting activity, the device comprising:a base comprising an upper surface to support and to be opposite a lowermost walking surface of a sole of the boot; at least one lateral edge connected to the base so as to be opposite at least one lateral portion of the boot; a rear support element provided to receive an upper of the boot at a rear of a user's leg, said lateral edge and the rear support element each having an inner surface provided to contact the boot; at least one linkage adapted to extend over the boot to hold the boot on the base; at least one friction-increasing structure projecting from at least one of the inner surfaces to oppose upward movement of the boot in relation to the upper surface of the base and for reducing small displacements of the upper of the boot with respect to the device during use of the board. 26. A device according to claim 25, wherein:said friction-increasing structure is constituted by an alternation of projections and recesses. 27. A device according to claims 26, wherein:each said projection is a tooth; and each said recess is a groove. 28. A device according to claim 27, wherein:said teeth and said grooves extend substantially parallel to an upper surface of said base. 29. A device according to claim wherein:said friction-increasing structure comprises ribs housed in cavities of said at least one lateral edge or of said rear support element. 30. A device according to claim 25, wherein:said at least one lateral edge comprises first and second lateral edges connected to said base so as to be opposite lateral portions of the boot, said device further comprising an arch connecting said first and second lateral edges at a rear of said base; and said friction-increasing structure comprises ribs housed in cavities of said first and second lateral edges, said arch, or said rear support element. 31. A device according to claim 25, wherein:said at least one lateral edge comprises first and second lateral edges connected to said base so as to be opposite lateral portions of the boot; and said friction-increasing structure comprises two friction plates projecting from an inner surface of said first lateral edge and two friction plates projecting from an inner surface of said second lateral edge. 32. A device according to claim 25, wherein:said friction-increasing structure comprises a fabric. 33. A device according to claim 32, wherein:said fabric comprises a multitude of projecting fingers. 34. A device according to claim 33, wherein:said projecting fingers have a length in a range of 0.1 and 3.0 millimeters. 35. A device according to claim 33, wherein:said projecting fingers have a diameter in a range of 0.05 and 1.0 millimeters. 36. A device according to claim 25, wherein:said rear support element is journalled for movement relative to said at least one lateral edge. 37. A device according to claim 25, in combination with a flexible boot, wherein:said boot is adapted to a sporting activity and includes a sole, an upper, and at least one friction plate projecting from a lateral portion of said sole and/or from a portion of said upper for contact with said friction-increasing structure. 38. A device according to claim 25, wherein:said at least one lateral edge comprises first and second lateral edges connected to said base so as to be opposite lateral portions of the boot; and said friction-increasing structure comprises at least one friction plate projecting from an inner surface of said first lateral edge and at least one friction plate projecting from an inner surface of said second lateral edge. 39. A device according to claim 25, wherein:said friction-increasing structure comprises a plurality of projections adapted to contact the boot. 40. A device according to claim 25, wherein:said friction-increasing structure comprises a layer of material with a plurality of projections adapted to contact the boot, said layer and plurality of projections being a unitary plate, said plate having a surface fixed to said inner surface against movement relative to said inner surface. 41. A device according to claim 25, wherein:said friction-increasing structure comprises at least one plate fixed to said rear support element, at least said one plate having a plurality of projections adapted to contact the boot. 42. A device according to claim 25, wherein:said friction-increasing structure has a height extending along said one of said inner surfaces; a boot-contacting face of said friction-increasing structure, in vertical cross section along an entirety of said height, is nonlinear. 43. A device according to claim 42, wherein:said friction-increasing structure has a width extending along said one of said inner surfaces; a boot-contacting face of said friction-increasing structure, in horizontal cross section along an entirety of said width, is straight.