TourDri hard warmers provide natural heat energy which are ideal for cold days on the course. Whether they’re being used to warm hands or the insides of gloves, each hand warmer is ready for use in under 5 minutes can last up to 12 hours of heat and are fully biodegradable after use. TourDri products provide effective and essential protection from the elements with superb lasting performance in the harshest of conditions on the golf course.