Tired of remembering to use Anti-Fog Sprays and Gels before you get in the water, when Snorkeling-or-Scuba Diving? That Old-Fashion-Way" of remembering one-more-thing before entering the water is a think of the past with Tusa's Anti-Fog Film. The Tusa Anti-Fog Film will keep your favorite Mask Fog-Free while Diving Underwater. The Film is made with Long-Lasting Durable Material. With 2-Models to choose from for Single or Two Lens Masks the Tusa Anti-Fog Film can be Installed-Easily on Any-Mask and is Reusable with Proper Care. Easy-to-Clean Film is covered by a 12 month limited warranty.