The Arena Python Mirror Blue Mirror White goggles?feature mirrored lenses which help provide?additional protection against harmful UV rays?for outdoor swimmers?and assist in cutting down on the sun's glare in well-lit pools.?Arena?developed the snake-eye shape?offering wide vision and hydrodynamic performance.?This?design is watertight and has durable hard lenses giving you a clear view and the soft silicone seals and strap provide comfort.?The adjustable dual strap helps you get the best fit.