A top choice of athletes, skiers, campers, hunters, anglers, spectators, construction workers, and more, the Yaktrax Foot Warmers provide a safe, long-lasting heat source so you can stay outside and enjoy the great outdoors longer. . Fits womens shoe size 9+ / mens size 8+. Includes 2 warmers per pack. Provides up to 5 hours of safe, natural heat. Air-activated and odorless. Environmentally friendly. Contents: iron powder, water, salt, activated charcoal, and vermiculite. Average activated temperature: 105°F (40°C)
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