Anyone who enjoys the outdoors & wants to stay outside longer but really feels the cold will appreciate these Toe Warmers from Yaktrax. They are odourless, environmentally safe & provide a heat source for comfort in all cold conditions & the have an adhesive backing to keep them in the right place throughout the day. Yaktrax Toe Warmers are the choice of athletes, anglers, hunters, campers, spectators, skiers, construction workers & more. The average activated temperature is 40°C.