Description 100% Waterproof Protection: Rubber is naturally waterproof and with our proven formulas, our rubber remains durable and waterproof year after year. Wool Felt Midsole: Naturally insulating, our wool felt midsole also helps with air circulation and odor control. Adjustable Top Strap:nCustomizable for a secure fit around your calf. Ankle Fit: Our revolutionary fit ensures a secure and comfortable fit around your ankles, while gripping the top of your foot and locking your heel in place. Air-Grip Outsole: Don’t let the mud, muck, or snow weigh you down. Our Air-Grip outsole features a unique, self-cleaning tread pattern that keeps you steady in the nastiest of terrain.