Grabber Warmers, toe. Box of 40 pairs. Adhesive. Heats for up to 6 hours. Thin with a unique rounded toe and adhesive backing, they are designed to function in the low oxygen environment of boots and shoes. These air-activated warmers start heating in just a few minutes after the package is opened - no shaking or kneading required. Great for skiers, snowboarders, hunters, campers, and anyone suffering from health-related cold hands, these hand warmers enhance your enjoyment of outdoor winter activities.