100% Waterproof from top to bottom to keep feet warm and dry. Constructed with 7mm Neo-Tech waterproof insulation. Durable, hand-lasted rubber over a four-way stretch inner bootie. DuraFresh natural bio-technology activates to fight odors. BOGS Max-Wick evaporates sweat to keep feet dry. BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats. Self-cleaning outsole. Easy on handles. Reflective temperature rating mark on heel. Comfort rated to -30°F/-34°C