Whoever rocks these 100% waterproof bad boys with their slip-resistant soles, their plush lining and their 5mm NeoTech insulation (for a comfort rating to forty below zero), should also appreciate the Dura- Fresh natural bio-technology, which fends off unattractive odors. And its BLOOM algae-based footbed, which protects endangered water habitats.100% Waterproof. Constructed with 5MM Neo-Tech waterproof insulation. DuraFresh natural bio-technology activates to fight odors. BOGS Max-Wick evaporates sweat to keep feet dry. Plush lining for warmth and comfort. BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats. GlacialGrip slip resistant outsole for maximum traction on wintery surfaces. Comfort rated to -40°F/-40°C.