Mountain horse rimfrost rider ii this is a perfect hardworking everyday boot great for winter it has a thermolite lining for extra warmth and uppers made from strong duralon for those damp and cold conditions there is a flexible hydrotx membrane that fits between the leather and the lining and prevents water entering into the footpart up to the zipper mountain horse have their own impressive impact protection system or ips which incorporates a forged steel shank in the heel for foot