Birkenstock Professional SUPER-BIRKI Unisex Occupational Clogs in White. Upper Material: Polyurethane. Lining Material: Synthetic. Sole Material: Polyurethane. Closure/Fastening: Slip-On. Features: Waterproof. Toe Shape: Round. Shoe Width: Regular. Item Weight: 0.5 KG. Heel Height: Flat (Under 2.5cm). Shoe Shaft Height: Low Top. Shoe Style: Occupational/Non-Safety Shoes. Sandal Style: Sandals. Safety Features: Slip Resistant Sole, Energy Absorbing Heel. Safety Standard: EN ISO 20347:2012.