HeatMax Heated Insole with Adhesive Backing (Pack of 5) 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(TM) Ready to use, air activated warmer. Ultra Thin. One pair per package. Pack of 5 (2 Insoles Per Pack)