The Advanced Chassis helps stabilize your heel, and it's surrounded by generous cushioning for maximum comfort on the trail. A refined last works with the reinforced top arm of the sensifit, holding your foot comfortably in place, especially moving downhill.Utilizing Descent Control Technology, this shoe hugs your feet comfortably for more confidence to attack the downhill's. The ever popular X ULTRA 3 WIDE GTX offers the lightweight precision and foothold you need for technical ascents and descents, with a wider fit.