Keeping toes warm in cool or cold weather is always a concern of the avid outdoorsman, and the HeatMax HotHands Toe Warmers does the job. HotHands 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. HeatMax HotHands Toe Warmers have full adhesive on one side that sticks to your socks for up to 8 hours of warmth. Not recommended for those who would be stationary for long periods of time.Made in USA. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Warmers.