HIGH QUALITY ABSORPTIVE MATERIAL - Made with high quality moisture absorbing silica gel on strong cellulose fiber. REUSABLE - These inserts can be used multiple times before they need to be thrown away. When you want to remove moisture form the inserts you can simply bake the inserts in the oven at 300F for 5 minutes. Be sure to let the inserts cool before handling or placing them into the camera housing. NO MORE FOG - Using our anti-fog inserts will help prevent excess moisture forming on your lens and inside the underwater housing. When filming in cold or humid environments fog inside the housing from the heat of the camera.