The Northwave Celsius boot is perfect for XC and similar riding in the winter season. It is made with a Gore Tex membrane, which keeps water out. The boot is also well-insulated, helping to retain heat when the temperature is low. The sole is carbon-reinforced with a stiffness index of 8 out of 15. It is fastened with a dial closure to ensure there are no pressure points on the foot. The Climaflex collar keeps wind and water out and provides additional insulation around the ankle.