HotHands® Hand Warmers are the cold weather solution you've been looking for, providing up to 10 hours of instant and continuous warmth for the hands. These single-use, air-activated heat packs are made of natural materials including iron powder, water, salt, activated charcoal, and wood fibre. Once removed from the specially designed outer packaging, exposure to air activates the ingredients, and the warmer begins to build heat. Slip them into your pockets or gloves to create a warm and cozy cocoon for your hands that lasts up to 10 hours. HotHands® Hand Warmers are ideal for sports, spectators, and anyone who works or plays outdoors. Instructions: 1. Do not open the outer protective package until ready to use. 2. Remove the inside pouch from the outer protective wrapper. Shake the pouch to mix and activate the contents. Do not open the inside pouch. 3. Allow 10 to 20 minutes for the warmer to heat up.