Big Pack OF ADHESIVE TOE WARMERS 8 pair Heat Factory Toe Warmers are designed to heat in the restricted air environment of a shoe or boot for up to 6 hours. The half moon shaped Toe Warmer adheres to the bottom of your sock for comfortable warmth. Ideal for daily use in shoes, ski boots, or whenever toes are cold. Not intended for use in open air. The warmers are odorless, non-toxic and air-activated.