A top choice of athletes, skiers, campers, hunters, anglers, spectators, construction workers, and more, the Yaktrax Adhesive Toe Warmers provide a safe, long-lasting heat source so you can stay outside and enjoy the great outdoors longer.. . . . Contains 10 pairs of toe warmers. Provides up to 5 hours of safe, natural heat. Adhesive backing keeps the warmers in place inside your shoes/boots. Air-activated and odorless. Environmentally friendly. Contents: iron powder, water, salt, activated charcoal, and vermiculite. Average activated temperature: 105degF (40degC).