Heat Treat Mega Warmer is a portable, everyday heat source you can take anywhere. Just open the package and within minutes the mega warmer will keep you warm for over 12 hours. It's dry, clean, odorless, non toxic, and non-flammable. When the Mega Warmer has done its job, just throw it away. Great for pockets, in a Grabber sleeping bag pouch, or as refills for any Grabber cozy muff or Grabber stadium seat. 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 joints and muscles as a result of Arthritis, Raynaud's, Lupus, Scleroderma, Sjogren's, Myalgia, or just poor circulation, Heat Treat provides soothing warmth. 30 packages per box; 1 warmer per package. All Heat Treat Warmers are designed for 1 time, disposable use.