Design: DuraFresh natural bio-technology activates to fight odors BOGS Max-Wick evaporates sweat to keep feet dry Hands free entry with wider opening 100% Waterproof from top to bottom Heel kick for hands free removal Natural rubber In-Shoe Comfort: BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats Durability and Traction: Self cleaning rubber outsole Additional Details: Circumference: 14 in. Height: 8 in.