100% Waterproof. Natural hand-lasted rubber and a four way stretch inner bootie. Easy pull on handles. 7mm Bogs® Neo-Tech™ insulation. Bogs Max-Wick™ moves sweat away from your foot to keep you dry. Dual-density, contoured EVA footbed with DuraFresh. Non-marking and self-cleaning outsole. Comfort rated from temperate to -40˚F/-40˚C.