•Prevents fogghing: Use in cold or humid climates to avoid excess moisture building up on your lens and inside the GoPro housing. •Reusable: Inserts can be used multiple times. To remove the absorbed moisture ply bake in an oven at 300F for 5 minutes. When traveling through cold or humid climates with your GoPro, moisture can easily build-up inside the housing and on your lens. •Compatible with all GoPro/SJCAM/Yi MODELS: Hero and Hero 2 owners should place one insert on either side of the camera. NOTE: Hero 3 and 3+ owners should place one insert on the side with the lens and one in the bottom. •Also suitable for other camera and housing system: Can be used in any devices where moisture build-up causes issues. •Absorptive material: Made with silica gel on cellulose fiber.