https://www.mccoys.com/shop/p/30350134/grabber-warmers-hwes-mini-hand-warmer
For skiers, hunters, fishermen, golfers, campers or anyone who works or plays in the cold. Portable heat source that operates at an average temperature of 135 deg F that last for seven hours or more. Easily fits in gloves and pockets. Air activated.
Specifications
135 deg F Average, 7 hr Continuous Warmth
Dimensions
3-3/4 in L x 2 in W