Sport shoe, has round protrusion on underside of sole to reduce risk of ankle or knee injury

摘要

A round protrusion (3) is present on the underside of the sole (2). The protrusion can be integrally formed from the sole or it can be a separate part secured to the sole by adhesive, welding, a click-fit joint or screws. The protrusion and sole can be made from the same material or different materials.