Drop these handy Anti-Fog Inserts into the sides of your HERO3's camera housing to prevent fogging in cold and humid environments. Reusable pads work for approximately 4 uses. To dry out and reuse, simply heat the inserts on a pan in the oven at 300° F for 5 minutes. Store in an airtight bag. For use with all GoPro cameras. 12 inserts per pack.