HotHands chemical warmers will start to generate heat as soon as they’re exposed to air. Air exposure will activate 100% natural materials inside warmers triggering a chemical reaction.

HotHands chemical warmers are convenient and cheap and provide anywhere from 6 to 18 hours of warmth depending on product. Warmers can also be placed into special pockets in HotHands apparel, including hats, socks and other clothing.