Design: 100% waterproof Constructed with 3MM Neo-Tech waterproof insulation Steel shank in outsole for stability and support Zipper on lateral side 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 Rebound cushioning provides all-day comfort and energy return Low pile faux fur lining for warmth and comfort 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 -40°F/-40°C