Super HotHands are larger air-activated hand and body warmers designed to last up to 18 hours providing safe, comfortable warmth in the coldest of temperatures. When placed in pockets or between layers of clothing, these warmers will help you enjoy cold weather activities longer, whether it s hunting, fishing, working or just being a spectator. FEATURES. Individually sealed in airtight package to guarantee a shelf life of six years. Portable. Odorless. Disposable. Safe. Nontoxic, nonflammable. Environmentally friendly.