Thaw disposable hand warmers are small, air-activated heat packs for cold mornings in the hide, at the stands, on a hike or on site in winter. Open the outer packet, shake the warmer and it starts heating within minutes, with no batteries or fuel. Thaw rates the small hand warmer for more than 10 hours of natural heat and up to about 51 °C. Slip one into a glove or pocket. They are odourless, ready to use and have a shelf life of about three years unopened, so a box can stay in the vehicle or kit bag until it is needed. Each warmer is single-use. This bulk box holds 40 pairs (80 warmers). Do not place directly on bare skin for long periods or use while sleeping.