Milwaukee® M12™ Heated Hand Warmer: The Milwaukee M12™ Cordless Black Heated Hand Warmer integrates carbon fiber heating elements between a durable wind and water resistant exterior and thermal fleece liner to heat your hands and help maintain dexterity, even on the coldest days. Featuring dual-cuff construction that forms a wind-proof seal in combination with the outer layer, the hand warmer provides up to 6 hours of continuous heat per battery charge reducing the need for bulky gloves on or off the jobsite. Adjustable heat zones provide the right amount of heat for any situation. Utilizing the same M12™ REDLITHIUM™ Battery technology that powers 60+ tools, the M12™ Battery holder is stored in a sleek back pocket that can expand to fit M12™ XC Batteries for extended run-time. All M12™ Heated Hand Warmers are washer and dryer safe. One size fits most.