Grabber warmers offer superior, all-natural, portable heat and are standard equipment for anyone who enjoys outdoor activities when it&';s cold outside. Warmers are air-activated, no shaking or kneading required; just open the package and allow a few minutes to start the process. Grabber Warmers are dry, clean, odorless, non-toxic, non-flammable and designed for one-time, disposable use. The toe warmers are made with a thin with a unique rounded toe and adhesive backing. Designed to function in the low oxygen environment of boots and shoes. Simply stick the Warmers to the outside of your sock, under or over your toes, and enjoy more than 6 hours of warmth.