This is the Atomic Sub Frame ARC Anti-Reflective Coating Technology Scuba Diving Mask Features: Atomic Sub Frame w/ ARC Technology" Mask So durable, it carries a Lifetime warranty against frame breakage Atomic Aquatics developed ARC (Anti-Reflective Coating) technology to reduce reflected light The result is a greatly improved transmission of 98% of available light Clearer, crisper vision. You will see more clearly underwater and objects in the distance will become more defined and acute Increased contrast and clarity Reduces eyestrain, glare, and prevents ghost images on the viewing area of the lens An absolute must for night diving, limited visibility conditions, and underwater photographers The strongest and most indestructible two-window mask ever! "