B&H Photo Video offers the for $19.99 .
The primary feature of is their ability to absorb moisture inside a camera's waterproof or dive housing , preventing the lens from fogging in cold or humid environments. Key Features and Specifications gopro anti fog best buy
Other options are available from Pitman Photo Supply and Rockbrook Camera . GoPro Anti-Fog Inserts: Really Necessary? - ScubaBoard B&H Photo Video offers the for $19
: Specifically designed to stop condensation from forming on the lens when moving between different temperature ratios (e.g., warm air to cold water). warm air to cold water).