Design: 100% waterproof Medial zipper and heel pull loop for easy entry In-Shoe Comfort: BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats BOGS Max-Wick evaporates sweat to keep feet dry Durability & Traction: GlacialGrip slip resistant outsole for maximum traction on wintery surfaces Additional Details: DuraFresh natural bio-technology activates to fight odors Comfort rated to -13°F/-25°C