Forcefield Rechargeable Heated Glove Liners - BlackUpgrade your gloves with these rechargeable heated liners. They use soft, stretchy fabric that fits snug and lets you move freely. Warm wires heat the back of your hands to keep blood flowing. A long cuff blocks out cold air and snow. Powered by two lithium ion batteries, they run up to 4. 5 hours on low. Stay toasty in freezing temps. FEATURES The hand conforming soft 4 way stretch material ensures excellent dexterity while wearing gloves. The