With Lifesystems Air-activated Hand Warmers, you get a Reliable heat Source for cold days. These hand Warmers are Activated by air and Start Providing heat in a few Minutes, so you Quickly get warm Hands. Perfect for Winter Activities such as Hiking, Hunting, or just a cool day in the city. They are Single-use and Provide Constant heat for up to 12 Hours, Making them Ideal for Longer Stays in cold Weather. The Package Contains 2 Pieces. Suitable for both men and Women, These hand Warmers are a Great Accessory for Anyone who Spends time Outdoors in cold Weather.