Prevents Fogging in Cold Weather, Prevents Fogging in Humid Conditions, Each Insert Will Last Approx. 4 Uses, Use with All GoPro Camera Housings, Package Includes 15 Anti-Fog Inserts The GoPro Anti-Fog Inserts includes 15 inserts that can be dropped into the sides of your GoPro camera housing to prevent fogging in cold weather and humid environments. Each insert can be reused approximately four times and you can dry them after use by placing them in the oven at 300? F for five minutes. The inserts should be stored in an airtight bag and they are compatible with all GoPro cameras.