The Northwave Celsius boot is perfect for XC and similar riding on cold winter days. It is made with a Gore-Tex membrane, which keeps water out. The boot is also well-insulated, helping to retain heat inside when the temperature is low. The sole is carbon-reinforced with a stiffness index of 8 out of 15. It closes with a rotary buckle, ensuring there are no pressure points on the foot. The Climaflex collar keeps wind and water out while providing additional insulation around the ankle.