The Sony AKA-AF1 anti fog inserts are a simple but effective way to
minimise moisture inside the waterproof case of the Sony Action Cam.
Just place an insert inside the waterproof housing to help prevent
fogging in cold and humid environments, thereby keeping a clearer lens
that records higher quality video. Set includes 2 anti fog inserts,
which dry naturally between uses and can be reused up to 1000 times.