All of the same innovative features as the Rimfrost Rider in a lace paddock. A built-in waterproof and breathable sock keeps feet dry and comfortable. The heat insulating Thermolite lining keeps you toasty. Boots also feature the Mountain Horse patented Stirrup Control System, steel shank and removable insole. Heel part is fitted with the shock-absorbing IPS system which reduces shock impact while walking. Fabric: Fabric: Duralon/Hydrotech. Lining: Thermolite.