The ideal choice for skiers who demand the best in boots for long distances and high altitude tours. Also the best option for tours with difficult climbing both on ice and rock, thanks to its short rockered sole and perfect crampon compatibility. The additional Downhill Booster tongue makes it extremely supportive during even the most technical and steep descents, while the racing-derived Ultra-Lock system allows for incredible cuff rotation and uphill agility with a super fast, single-motion transition from walk to ski mode. The Performance version is the top-of-the-line, with a Carbon Fiber cuff for lightness and maximum downhill support. In addition, a rear spoiler provides an adjustable forward lean angle.