Experience World Cup control. Elite-level precision is all yours with the podium-proven Rossignol X-IUM Carbon Premium+ Skating Ski Boots. Designed for competitive athletes, an integrated carbon chassis and full carbon cuff deliver an ultralight feel and responsive power to every stride. The fit is designed to match the natural shape of the foot for world-class comfort and precise power transfer to the ski. A full-height lace cover enhances weather resistance to keep feet warm and dry. Carbon Cuff is shaped to match the natural contours of the foot for maximum stability and power transmission. Integrated Carbon Chassis offers best-possible stability and power transmission. Carbon Heel Counter provides increased rigidity and precise control. Speed Lace Lock System offers fast, easy closure for increased support. Full-height lace cover enhances waterproof coverage for dry feet. Thermoadjustable liners can be heat-molded around your feet for customized fit and comfort.