Abstract: Footwear element including a flexible outer sole assembly and a flexible upper, the footwear element extending lengthwise from a rear end to a front end, widthwise between a lateral portion and a medial portion, and height-wise from an outer surface of the outer sole assembly to an upper end, the footwear element having a shoe insertion opening. The footwear element includes spikes projecting from the area of the outer surface of the outer sole assembly. The footwear element includes at least one reinforcement, the reinforcement including a base and a wall, the base extending opposite the outer sole assembly outside of the footwear element, the wall extending from the base toward the upper end, also outside of the footwear element.

Abstract: A footwear element includes a sole assembly extending along an extension direction between opposite front and rear ends; a flexible upper includes a lower portion adjoining the sole assembly and configured to receive a shoe of a user, and an upper portion extending from the lower portion away from the sole assembly; and a fastening element configured to cooperate with a locking mechanism provided on the apparatus for reversibly retaining the footwear element on the apparatus. The fastening element is removably mounted on the footwear element.

Abstract: Footwear element including a flexible outer sole assembly and a flexible upper, the footwear element extending lengthwise from a rear end to a front end, widthwise between a lateral portion and a medial portion, and height-wise from an outer surface of the outer sole assembly to an upper end, the footwear element having a shoe insertion opening. The footwear element includes spikes projecting from the area of the outer surface of the outer sole assembly. The footwear element includes at least one reinforcement, the reinforcement including a base and a wall, the base extending opposite the outer sole assembly outside of the footwear element, the wall extending from the base to the upper end, also outside of the footwear element.

Abstract: A footwear element including a flexible outer sole assembly and a flexible upper, both of which demarcate a fitting volume, the footwear element extending lengthwise from a rear end to a front end, widthwise between a lateral portion and a medial portion, and height-wise from an outer surface of the outer sole assembly to an upper end, the footwear element having a shoe insertion opening. The footwear element includes spikes projecting from the area of the outer surface of the outer sole assembly. The footwear element includes a removable reinforcement having the general appearance of a plate, the reinforcement extending lengthwise from a rear end to a front end, widthwise between a lateral side and a medial side, and depth-wise between a support surface and a receiving surface, the reinforcement being arranged opposite the outer sole assembly, and the reinforcement being substantially non-deformable in longitudinal flexion, along a transverse axis.