These hand warmers provide up to 8 hours of continuous warmth—in any place, at any time. Keep several on hand in emergency kits, camping gear, and the trunk of your car. The Hand, Pocket & Glove Warmers heat up in minutes. Ideal for winter sporting events, outdoor activities, camping, fishing, and other outdoor situations. Invaluable as an instant heat source in emergency situations. Environmentally safe and disposable. Inner contents are biodegradable.