Simply the strongest, most indestructible dual lens Atomic mask on the market, the SubFrame has a stainless steel nose piece that holds those lenses in place. Rated excellent for dryness, the construction of this mask speaks volumes. With an internal frame molded directly beneath the surface of the silicone skirt, not only is this a low volume mask, this mask provides strength and rigidity, and eliminates the bulky external plastic frame. Now that's a mask we can get behind.