HotHands Insole Foot Warmers 4 Pack (8 total) with Adhesive - Pack of 4 pairs (8 Total) The combination of the ingredients has been specially formulated to ensure a constant and comforting heat for a wide variety of uses. Up to 9 hours of heat With adhesive on one side so It stays where you stick it Ready to use, air activated warmer. Ultra Thin. One pair per package.