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PIP Boss Therm Heated Glove Liner is a one size fits all heated glove liner helps keeps workers hands warm without sacrificing dexterity. Made to be worn under any glove, the Boss Therm heated glove liner is constructed from a 4-way stretch material that conforms to the hand and the heating element located on the back of hand warms the blood as it circulates through the hand. With three separate settings easily select your preferred temperature range, LOW HEAT(Green) - 90° F, MEDIUM HEAT(Blue) - 110° F, HIGH HEAT(Red) - 125° F.