Keeping hands, feet, or body warm in cool or cold weather is always a concern of the avid hunter. HeatMax HotHands Heated Insole Foot Warmers are made of natural materials. Once removed from the specially designed outer packaging the exposure to air activates the ingredients and the warmer begins to build heat. Always allow 10 to 20 minutes for the warmers to reach their optimal temperatures. Adhesive insole stays put inside shoe or boot. Gives you 9 hours of heat. Safe and comfortable with all-natural ingredients. One size fits most men and women. Imported.