From Amazon.ca
Designed for skiers, hunters, fishermen, golfers, or anyone who works or plays in the cold for long hours, the Heatmax HotHands-2 Hand Warmers are air-activated and will provide up to 10 hours of soothing warmth inside gloves, pockets or wherever you feel a chill. All Heatmax warmers are made of natural materials, including iron powder, water, salt, activated charcoal, and wood fiber. When exposed to air, these materials react together to produce heat through an extremely fast oxidation (or rusting) process. Users should allow 10 to 20 minutes for the warmers to reach their optimal temperatures.
Product Description
|Safe and easy-to-use heat source for gloves socks and more |Air-activated |Up to 10 hours of constant comforting heat |Ultra-thin rectangular packs fit easily in a variety of spots - put heat where you need it Providing up to 10 hours of 130-140 heat HotHands warmers are a safe and easy-to-use heat pack that help keep your hands warm when the temperature gets cold. Air-activated heat packs are formulated to deliver a constant comforting heat. Ultra-thin rectangular pack fits into shoes gloves and other spots needing a shot of warmth easily. Made in USA.