The Northwave Ghost XC shoes are manufactured with a 100% unidirectional carbon Hyperlight XC sole with a stiffness index of 14.0 for superior power transfer. Hyperlight XC sole, 100% unidirectional carbon with a stiffness index of 14.0 for maximum power transmission; Michelin rubber inserts, 28% more resistant than TPU, with Dual Layer Compound Technology for excellent grip and minimized weight; Upper with patented Xframe® construction, made of latest-generation materials only 0.5 mm thick, transfers every watt of power by tightening the foot maximally and evenly without any pressure points; ...