Not Cheap but they work perfectly, a must have accessory.,
Verified Purchase(What is this?)
This review is from: GoPro Anti-fog Inserts for HERO2 Cameras (Camera)
I was a little dubious about the value and use of these inserts but after one use I am convinced. Do not waste your time trying to record in the water without these. They workout around £1 or less a session so not as expensive as they first seem. A must have accessory.