Bogs Women's Neo-Classic Exotic Insulated Waterproof Winter Boots - Lightweight and warm for all season comfort. 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. Flex Width insole system adapts to foot width Heel Lock prevents heel slip and ensures optimal fit Height: 14in Temperature rating: -58°F/-50°C Calf circumference: 15in