Hand warmers are insulating packets used to warm the hands during outdoor activities. Hand warmer are activated by shaking, grasping, or exposing them to the air. They can be conveniently placed inside jacket pockets or gloves. When used properly, they can provide warmth for up to 40 hours.

Hand warmers contain a mixture of salt, cellulose, water, iron, sodium acetate, and vermiculite. hand warmers come in disposable, reusable, and miniature types suitable for any outdoor activity like skiing, hiking, and camping.