Altai Skis Hok with Xtrace Binding 125, Unisex, 125 Bindings: comes with Universal Xtrace binding Sizes: available in two sizes, 125 or 145. The 125 is a better snowshoe substitute. While the 145 is more in the downhill ski fashion. synthetic climbing skin integrated into the base of the ski steel edges for durability lightweight cap construction with a sustainable paulownia wood core reinforced with a combination of organic natural fibers and fiberglass.