Birkenstock Professional SUPER-BIRKI Unisex Occupational Clogs in White. These clogs are designed for professional use and feature a slip-on closure. The upper and sole are made of durable polyurethane, with a synthetic lining. They have a round toe shape and a regular width fitting. Key features include being waterproof, having a slip-resistant sole, and an energy-absorbing heel, meeting the EN ISO 20347:2012 safety standard. The heel height is flat (under 2.5cm) and they are a low-top shoe style. Product code: 68021.