Hand warmers or toe warmers are small mostly disposable packets which are held in the hand and produce heat on demand to warm cold hands. They are commonly used in outdoor activities such as hiking and skiing to keep extremities warm and assist insulated clothing. Depending on the type and the source of heat, hand warmers last between 30 minutes to 12-24 hours. ArmyUniverse provides specific hand warmers that act as a portable heat source to extend your cold weather activities. Hand warmer is a perfect accessory for hiking, camping, hunting, fishing, doormen, garbage collectors, park rangers and many more. Hand warmers are used by outdoor workers and sports enthusiasts such as skiers to increase the temperature and movements of hands in inclement weather. Heating your extremities through warmers is an important safety precaution used to prevent frostbite and injury.