100% Waterproof from top to bottom to keep feet warm and dry. Constructed with 5mm Neo-Tech waterproof insulation. Made with seamless construction, 30% lighter and more durable. DuraFresh natural bio-technology activates to fight odors. Rebound cushioning provides all-day comfort and energy return. BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats. BioGrip slip-resistant outsole. Reflective temperature rating mark on heel. Comfort rated to -35°F/-37°C