SFH. 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 over a four-way stretch inner bootie BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats Easy on handles Comfort rated to -22F Reflective temperature rating mark on heel