This is the Tusa Paragon Mask Scuba Diving Snorkeling Mask Features: TRI-MIX Frame Freedom Technology with Fit II UV 420 Lens Treatment + Anti-Reflective Lens + CrystalView Optical Glass Angle Strap Adjustor with Side Hold Offset Buckle Corrective lens available: MC2001SA Non-Reflective lens available: ML2001S Introducing the new advanced M2001S Paragon professional divers mask. The new Paragon mask offers TUSA&';s NEW Reinforced TRI-MIX frame, Freedom Technology with Fit II, and the UV 420 Lens Treatment with AR and CrystalView Optical Glass which helps you dive with eye protection and ultimate clarity.