Hot Stuffies Warmers with 40 pairs provide a safe and efficient heat source in all cold conditions. Special natural and odorless design for comfort use, they are the best choice of skiers, spectators, campers, anglers, athletes and more. Our warmer generates comfortable average activated temperature at 105?/ 40?. They will take up to 20 minutes to reach maximum heat. With long-lasting heat of 5+ hours, they can revive and relax your feet and make you stay in the outdoors with more comfort and longer.