Power transmission is given from the Carbon XC12 sole, with 100% carbon inserts in the pedal area, a 12.0 stiffness index (a measurement that indicates stiffness on a scale from 0 to 15). Strategically placed TPU inserts enable major grip and abrasion resiMTB winter shoes with wind- and waterproof GORE-TEX KELVIN membraneCARBON XC 12 sole and additional full carbon insert in the pedal areaSole with strategically placed TPU inserts for high skid and abrasion resistanceXFRAME design with precise S.L.W.2 SYSTEM CLOSURE for accurate adjustmentsCLIMAFLEX cuff with very elastic GORE-TEX RATTLER membrane and insulating neopreneErgonomic heel shape for a close fitSeamless toe constructionPull tabs at the front and rear