100% Waterproof Rebound cushioning provides all-day comfort and energy return Made with seamless construction - 30% lighter and more durable Constructed with 5mm Neo-Tech waterproof insulation DuraFresh natural bio-technology activates to fight odors BioGrip slip-resistant outsole BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats. Heel Lock prevents heel slip and ensures optimal fit Reflective temperature rating mark on heel Comfort rated to -4 F