Let’s face it. Those disposable handwarmers at the gas station are useless. So, we took the bestselling 509 Backcountry Glove and added heat. Push a button and the 509 Backcountry Ignite Gloves warm your hands with up to five hours of heat. The compact and rechargeable 7.4-volt lithium-ion battery pack (sold separately) powers carbon heating elements on the back of your hand and thumb with three settings so you can dial in your comfort to match the conditions.