The large lens and close fitting skirt work in harmony to create perhaps the widest viewing angle of any frameless mask design. The lens shape was computer designed to maximize upward, downward and side to side vision. Because an external frame is not needed, the viewable area of the lens is optimized. Squeeze-to-adjust buckles are tucked behind the lens for a sleek hydrodynamic design. Frameless Mask Features Unmatched durability and resistance to breakage Optical quality, distortion-free UltraClear lenses Hydrodynamic styling with no exposed external frame Wide vision and low volume Great fit Squeeze to adjust buckles Clear or Black silicone with co-molded color accents Atomic Frameless Masks are also available in a Medium Fit size for smaller, narrower faces Atomic Frameless Masks come in a unique compact travel case that matches the skirt color – clear or black. The exclusive low profile travel case takes up only half the space of common mask boxes. Both SubFrame and Frameless Atomic Mask models are designed to fold flat to fit in a pocket or a compact travel case.