US Patent 9936768 Footwear element

A footwear element that includes an outer sole assembly and a flexible upper, as well as spikes projecting in the area of an outer surface of the outer sole assembly, the flexible upper including a lower portion adapted to cover the foot of a user, the flexible upper having a shoe insertion opening. The upper includes an upper portion extending the lower portion in a direction away from the outer sole assembly, the upper portion being provided to cover at least the ankle of the user, or the ankle and a portion of the lower leg.