Challenge the competition. World Cup inspired design and a low volume fit give the X10 Classic ski boot a responsive feel and podium-worthy precision for expert and fitness oriented skiers. The classic specific design shares technology with Rossignols' athlete-proven X-ium series to deliver competition level control and feel. They are insulated for warmth and protect your feet from wind and moisture. Precise Boot Flex, Fit Dual Core Technology allows targeted boot stiffness for the most responsive feel without a weight penalty Optimized Classic Flex Expert Classic Sole is tuned for improved foot roll and enhanced kick for classic skiing Wintherm offers a breathable micro-perforated membrane that reflects heat back towards its source for incredible temperature regulation, comfort and warmth Thermoadjustable liners can be heat-molded around your feet for a customized fit and comfort Dual Core Heel Counter Materials Lace Cover: PVC textile Lining: polyester, Win THerm acive membrane Sole: