Atomic Sub Frame Twin Lense Mask, The lenses are held in place by a stainless steel retainer and optically corrected lenses are also available. These masks also feature ULTRACLEAR lens technology, this uses a new optical quality glass to eliminate the green tint found in normal dive masks. This results in exceptionally high light transmittance and lack of distortion, maximising all of the available light. Silicone rubber skirt, Ultraclear Lens Technology, Sub-frame Technology