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This review is from: GoPro Anti-fog Inserts for HERO2 Cameras (Camera)
I would highly recommend these to anyone doing water sports with your GoPro. I went on a 2 week trip to Alaska and did some kayaking and had these and used them just as a precaution. Another person on the trip didn't have these and some of their footage got foggy from being put in and out of the water and wasn't nearly as clear as mine. These are cheap and really a no brainer.