HotHands Hand Warmers provide up to 10 hours of instant and continuous warmth for your hands. These single-use, air-activated heat packs are made from natural ingredients like iron powder, water, salt, activated charcoal, and wood fiber. Simply remove them from their packaging, and exposure to air will activate the ingredients, generating heat. Slip them into your pockets or gloves for a warm and cozy experience that lasts up to 10 hours. Ideal for sports, spectators, and anyone who enjoys outdoor activities. Instructions: 1. Keep in the outer protective package until ready to use. 2. Remove the inside pouch and shake to activate. Do not open the inside pouch. 3. Allow 10-20 minutes for the warmer to heat up. 4. Place in pockets or gloves for maximum efficiency. 5. If heat decreases, expose to air and shake. 6. Dispose of used pouch with regular garbage; all-natural ingredients are safe for the environment. Features: Supplied in pairs, up to 10 hours of continuous heat, air-activated (heats up 10-20 minutes after opening), environmentally friendly and safe natural heat, odorless single-use packs. Average Temperature: 135°F (57°C). Maximum Temperature: 158°F (70°C). Each hand warmer measures 5cm – 9cm.