Heat Factory Kids Hand Warmer - 8+ Hours Heat Each (40 Pair Warmers) Pack of 40 pairs of character designed warmers provide protection and instant and long-lasting warmth to children in cold outdoor activities Each Warm Buddies 'N Pals designed character warmer provides heat that lasts up to 10 hours each Simply open the outer package and expose the warmer packet to air for an instant heat source Safe, non-toxic and odorless heat warmers are pre-mixed with a biodegradable mixture of iron powder, charcoal, salt and vermiculite Unopened, the warmer has a shelf life of three years or more; warmers proudly made in the USA