The X2s goggle is form and function incarnate. Ultra-premium, the medium-sized goggle utilizes our Swiftlock lens changing system that makes swapping out lenses a breeze. Coupled with Lumalens color optimized technology that offer optimal color recognition and clarity. A robust anti-fog treatment and bonus lens are just icing on the cake. This goggle utilizes features derived from Dragon's patented Advanced Projects X (APX) technology Dragon X2S Goggles + Lumalens Red Ion Lens | Black | Christy Sports