Birkenstock Professional SUPER-BIRKI Unisex Occupational Clogs in White. These clogs are designed for occupational use and feature a round toe shape and a flat heel. The upper and sole are made of durable polyurethane, with a synthetic lining for comfort. They are slip-on for easy wear and are waterproof. Safety features include a slip-resistant sole and an energy-absorbing heel, meeting EN ISO 20347:2012 safety standards. The item weight is 0.5 KG and they are a regular shoe width.