Description:The Heat Factory Warmer is a soft, light-weight pouch containing an inert mixture of iron powder, charcoal, salt, water and vermiculite. When exposed to air, a natural exothermic reaction generates consistent and prolonged heat. The pouch is made of soft cloth lined with a very thin layer of porous plastic for maximum durability. The warmers are odorless, non-toxic and air-activated.Height (In):6Width (In):9 Depth (In):2.5 Weight: 1lb. 6 oz.The ideal 3-day combination pack for any outdoor adventure! The Outdoor Warmer Pack offers 6 pair hand, 3 pair toe, and 3 large body warmers to keep you playing outdoors all weekend long. Use the hand warmers for gloves and pockets, pre-heat your sleeping bag with the large 20+ hour warmers, and keep your toes warm, whether sitting at the camp site, or roaming around the great outdoors. Keep packs handy in gear bags, luggage, car, and boat. Sold 21 warmers per pack.