CamKix Anti-Fog Inserts for Gopro Hero 4 Black, Silver, 3+, 3, 2, 1 and Other Camera and Housing Systems – 20 Pack Reusable Moisture Removing Inserts
£4.49PREVENTS FOGGING: Use in cold or humid climates to avoid excess moisture building up on your lens and inside the GoPro housing.
REUSABLE: Inserts can be used multiple times. To remove the absorbed moisture simply bake in an oven at 300F for 5 minutes.
COMPATIBLE WITH ALL GOPRO MODELS: Hero and Hero 2 owners should place one insert on either side of the camera. Hero 3 and 3+ owners should place one insert on the side with the lens and one in the bottom.