They are insulated for warmth and protect your feet from wind and moisture. Dual Core Technology allows targeted boot stiffness for the most responsive feel without a weight penalty. Carbon midsole insert provides increased stability and precision for optimized skating performance. WINTHERM® offers a breathable micro-perforated membrane that reflects heat back towards its source for incredible temperature regulation, comfort and warmth. Our FW Fit offers reduced instep volume and narrower fit from midfoot through heel for increased comfort and precision.Thermoadjustable liners can be heat-molded around your feet for a customized fit and comfort. Polyester + Win Therm active membrane. 3D plastic reinforcement Dual Core.