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