Meet the king of the mountain. The MTB Premium offers a dual-zone BOA L5 lacing system that delivers ultimate comfort and response, allowing on-the-fly adjustability in two separate portions. We placed an upper BOA L5 closure at the top of the shoe and a midfoot L5 reel with power zone guides to allow 2:1 pull across the forefoot. The asymmetrically conforming upper is perforated and breathable, made of microfiber airmesh with a new adaptive fit pattern. The Ergologic insole features Poron shock dampening, adjustable arch support and removeable metatarsal button. The stiff carbon fiber sole has a stiffness index of 9.