Waterproof natural rubber, 4mm Neoprene lining, removable insoles, extension gusset to get them on and off quickly, exclusive Percussion non-slip sole with deep, wide treads and ridges designed to facilitate grip when walking and soil dispersion. Antitwisting steel reinforcement, exclusive SPS® (Shock Prevent System) cushioning system consisting of a honeycombed foam heel insert integrated into the structure of the sole, ergonomic shape.