Experience unparalleled warmth and dexterity with the Boss® Therm™ Heated Glove Liner. Designed as a one-size-fits-all solution, this heated glove liner enhances the warmth of any existing glove. Crafted from a soft, 4-way stretch material, it conforms perfectly to your hand without sacrificing dexterity. The innovative heating element, strategically placed on the back of the hand, warms the blood as it circulates, ensuring optimal comfort in cold conditions. Choose from three distinct temperature settings: LOW HEAT (Green) at 90°F, MEDIUM HEAT (Blue) at 110°F, and HIGH HEAT (Red) at 125°F. The extended cuff design prevents drafts and snow entry, keeping your hands completely protected. Each pair includes two USB rechargeable Li-ION Poly batteries, providing up to 2.5 hours of heat on the low setting. These durable liners are machine washable, with heating elements engineered to withstand over 50 washing cycles. Battery recharge time is approximately 2-2.5 hours. For extended use, consider replacement batteries (399-GLVBT). Stay warm and productive with Boss® Therm™.