The knee warmer is a special product from Thermopad and unique on the warmth market. Finally warm knees, no matter how cold it is outside. A stretch band with Velcro fastener holds the warmer in the desired position without restricting mobility. Warmth that does you good. Four large warming chambers provide constant, soothing warmth directly on the knee. Up to 8 hours of warmth prevent chilling, even during long periods in the cold air. Also ideal for the stadium or hunting.