HotHands Hand Warmers are designed for skiers, hunters, fishermen, golfers, and anyone who is looking to work or play in the cold for an extended amount of time. HotHands Hand Warmers are air-activated and will provide up to 10 hours of soothing warmth inside gloves, pockets or wherever you feel a chill. No shaking or kneading required; just open the package and watch it begin to go to work, as soon as it's exposed to the air.