Hand warmers offer a cheap and convenient route to warm cold hands. Hand warmers are air activated, simply remove the warmer from the packet and place in a pocket, allowing it to heat. Hand warmers are one time disposable use.
Invaluable in the event of an emergency, why not keep some in the car or boat in case of breakdown, in the house in the event of power failure, valuable additions to survival packs and first aid kits.
Uniheat warmers have been at the forefront of hand warmer technology for over two decades in the USA.