Atomic Aquatics Subframe Arc Scuba Diving MaskAtomic Aquatics Subframe Arc Scuba Diving Mask THE STRONGEST AND MOST INDESTRUCTIBLE TWO WINDOW MASK EVER The Atomic Aquatics SubFrame Mask is so durable, it carries a Lifetime warranty against frame breakage. The strength comes from the internal frame (subframe) molded directly beneath the surface of the silicone rubber skirt (patent pending). This subframe provides incredible strength and rigidity as well as eliminating the bulky external plastic