It concerns a prosthetic device for lower limb of a uses having a leg component, a foot component having a foot shell defining a first cavity within said foot shell and a coves component covering said leg component, said leg, foot and cover components being water compatible. The cover component is formed by an hollow flexible self-carrying sleeve defining a cavity within the sleeve around the leg component, the foot shell comprising a hole on its inner side, overlapping the sleeve on at least one centimetre and presenting an aperture below the sleeve to provide air communication between the cavity and the exterior. The cover component comprises in its upper part, a longitudinal slot, so that the water drains naturally from the first and second cavities.
