The Classic Boot by Bogs is 100% waterproof and made with durable hand lasted rubber with a four way stretch inner bootie. Constructed with 7mm Neo-Tech insulation. Lined with Bogs Max-Wick to keep feet dry. Contoured EVA footbed with. DuraFresh bio-technology that activates to fight odors. Non-marking and self-cleaning outsole. Comfort rated to -40?F/-40?C.