Review on GoPro Anti-Fog Inserts: Ensure Clear Vision with Official GoPro Accessory by Rick Ross

They appear to have been working on my most recent dives (30ft as well as 70-90ft) at Key Largo as I had no trouble shoeing my Silver Hero 3+. I placed two below (no problem) but it was very difficult to place one on the side next to the lens. I had to remove several layers to make the gasket thinner. Videos I've looked at online have shown that this side insert goes in easier, so I'm not sure I may have bought the wrong inserts for my GoPro model.