100% Waterproof – Constructed with 7mm Neo-Tech waterproof insulation and BOGS Max-Wick which evaporates sweat to keep feet dry DuraFresh natural bio-technology activates to fight odors and BLOOM algae-based EVA footbed helps clean polluted water habitats. Durable, hand-lasted rubber with a four-way stretch inner bootie with self-cleaning outsole 90° heel for support on rough uneven terrain and nylon shank in midsole for support and stability Comfort rated to -40°F/-40°C