Bogs Classic High Boot sports a ThermicFit one-piece inner boot works together with an insulating midsole to provide exceptional warmth. A sock-like liner, and durable shock absorption are all made to fit like an athletic shoe for totally seamless comfort. Bogs utilizes flexible, natural rubber to create 100% waterproof protection in any water-bogged situation. These rubber boots are comfort rated down to minus 20 degrees.