Heat Factory’s adhesive Foot Warmer Insoles are designed to be worn with socks inside shoes, boots and other air-restricting footwear. They provide up to 8 hours of reliable even heat. The Foot Warmer features an adhesive backing that adheres to the bottom of your sock, allowing it to stay in place when walking, biking, hiking, skiing and other activities. The Insole foot warmer has an ultra-thin design for comfort and measures the full length of an average insole to ensure your entire foot stays warm. The Heated Insole is designed for restricted air environments and therefore is not intended for use in open air.

The Heat Factory warmer is a soft, lightweight pouch containing a biodegradable mixture of iron powder, charcoal, salt, and vermiculite. When exposed to the air, an oxidation process takes place that generates heat. Heat Factory warmers are specially engineered to provide heat that is long-lasting, comfortable, and even. Heat Factory continually tests its products to ensure that you receive only the highest quality warmers that will consistently deliver warmth as advertised. Unopened, the Heat Factory foot warmer insoles have a shelf life of three years or more. Heat Factory's air activated hand warmers, body warmers, toe warmers, and heated accessories have been providing warmth and pain relief to outdoor enthusiasts for the past 30 years.

• Provide up to 8 hours of reliable even heat
• Features an adhesive backing that adheres to the bottom of your sock, allowing it to stay in place during activities
• Soft, lightweight pouch containing a biodegradable materials
• Designed for restricted air environments and therefore is not intended for use in open air