: Specifically designed to stop condensation from forming on the lens when moving between different temperature ratios (e.g., warm air to cold water).

: They are compatible with all GoPro camera housings, including older Hero models and modern dive cases.

: Must be stored in an airtight bag to prevent them from absorbing moisture from the ambient air while not in use. Quantity : Typically sold in packs of 12 or 15 inserts . Availability and Retailers

B&H Photo Video offers the for $19.99 .