Helix SPIN is an All mountain boot with a medium flex, it adapts to different terrains, a bit like your favorite hand bag. From backcountry to the slopes and then in the park, you’ll be really holding on to your style.The unique SPIN system assures a fast and secure closure so your foot can feel nice and locked. It requires 30% less turns compared to the other wire closure systems. Once again the Dyneema cable which is the same used on parachutes, is lighter than steel wire and has no memory problem. TF Liner.