This is the Tusa Reusable Anti-Fog Film for Scuba Diving Masks Fits any Two Window Mask Features: Easy installation Prevents Fogging Fits any 2-window mask Reusable Easy to clean Long-lasting durable material The TA-200A anti-fog film will keep your favorite mask fog-free while diving underwater. Made with long-lasting durable material, the TA-200A can be installed easily on any 2-window mask and is reusable with proper care. "