Designed for skiers, hunters, fishermen, golfers, or people who work or play in the cold for long hours. HotHands-2 hand warmers are air-activated and will provide up to 10 hours of soothing warmth inside gloves, pockets or wherever you feel a chill. Features: Packaged in pairs. Small size (2.25 in.x 4 in.) Produce heat (130F) Individually sealed in airtight package to guarantee a shelf life of six years. Portable (No wires or batteries) Odorless Disposable Safe Nontoxic, nonflammable Environmentally friendly Contains all natural ingredients Info from Heatmax