Bring the Heat! Hand warmers are single use air-activated heat packs that provide everyday warmt and are ideal for keeping your hands warm when the temperature gets cold. They provide safe, natural heat, so you can enjoy the great outdoors during those harsh winter months. Our hand warmers are designed to fit in your pockets or the palm of your hand. Convenient, Compact, Portable. Thoughtfully designed so you can enjoy hand warmers anytime, anywhere. Specs & Details: Quantity: 20 Individual Hand Warmers (10 pairs). Duration OF Heat: Up to 10 hours of heat. Activation Time: 15-30 minutes. Average Temperature: 135 degrees Fahrenheit (57 degrees Celsius). Max Temperature: 158 degrees Fahrenheit (70 degrees Celsius). Ingredients: Iron Powder, Water, Salt, Activated Charcoal, and Wood Fiber. Storage: Keep in a cool place out of direct sunlight. Directions - Do not open the outer package until ready to use. Remove warmer from the outer package: shake to activate. Do not open, puncture, or tear warmer. Warmer heats up in 15-30 minutes. If heat decreases, expose warmer to air and shake.