Grabber Foot Warmers are thin, comfortable air-activated Warmers that fit in your shoe or boot, and provide 5 plus hours of soothing warmth beneath your feet. This product is designed for one time use. Simply open the outer package and immediately place insoles inside any pair of closed-toe shoes or boots. Warmers are standard equipment for skiers, snowboarders, hunters, campers, hikers, birdwatchers or anyone who enjoys outdoor activities when the weather is cold. Warmers are widely used for portable, long-lasting heat therapy. If you suffer from cold, sore feet and toes as a result of Arthritis, Raynaud's, Lupus, Scleroderma, Sjögren's, Myalgia or just poor circulation.