The Heat Factory Footwarmer Insole is a soft, light-weight pouch containing an inert mixture of iron powder, charcoal, salt, water and vermiculite. When exposed to air, a natural exothermic reaction generates consistent and prolonged heat. The insole pouch is made of soft cloth lined with a very thin layer of porous plastic for maximum durability. Peel back the adhesive backing and press warmer to outside of sock underneath your foot.

• Length 9.75"
• Width 4.25"
• Thickness .5
• Weight 1.3 oz.
• Single use