A.F.S. – ADJUSTABLE FIT SYSTEM The system features a double upper. The inner part uses a special construction of open edges and an upper collar fitted with an elasticated band to adapt perfectly to the shape of the leg and offer excellent comfort. This inner part works in synergy with the outer structure that, equipped with the Adjustable Fit System, wraps the calf, respecting its ergonomics and offering a wide range of adjustment. This part can be personalized depending on individual needs with the aid of a Velcro(R) band positioned on the side.