Worn only once. If you thought it was impossible to improve on perfection, think again. From the Super 550 Series. Premium leather upper. Soft leather lining. Sturdy front and back pull-on tabs. Elastic gore side panels for easy on and off. Twin-needle reinforced stitching with a high tensile strength thread. Comfort EVA removable footbed with extra XRD® Technology in the heel pad. Shock Protection System (SPS) Xtra disperses shock at the heel strike and reduces skeletal stress on the feet, knees, and vertebrae. Polyurethane midsole for comfort and underfoot support. Dual-density thermopolyurethane outsoles are weatherproof, lightweight, durable