Heat Factory Toe and Foot Warmer with Adhesive Toe warmers designed to keep feet warm when skiing, hiking and hanging out Heats up restricted air environment of shoe or boot for up to 6 hours Soft, lightweight pouches contain iron powder, charcoal, salt, water and vermiculate Adhesive backing adheres to outside of sock underneath the toes; ultra-thin for comfort Not intended for use in open air; includes 40 pairs of toe warmers