Mountain horse rimfrost rider ladies boots the mountain horse rimfrost rider boots are a perfect winter boot suitable for long hours on the yard or in the saddle features include the impressive mountain horse impact protection system ips which includes a forged steel shank in the heel to reduce concussion and support the foot when worn for a long period of time for added comfort there are removable soft pile insoles and other features include a thermolite lining for extra warmth and uppers