Light yet tough, the Bogs Neo Classic Waterproof Rain Boot is a must-have. This knee-high winter boot features a Flex Width insole system that adapts to your foot width, and a heel lock that prevents heel slips to ensure an optimal fit. The rebound cushioning provides all-day comfort and energy return, while the BioGrip outsole is slip-resistant. Eco-friendly 5mm Neo-Tech waterproof insulation Seamless construction 30% lighter and durable DuraFresh natural bio-technology fights odor BLOOM eco-friendly, algae-based, removable EVA footbed that helps clean polluted water habitats Rebound cushioning Flex Width insole system Heel lock BioGrip chemical- and slip-resistant outsole Comfort rated to -58F/-50C.