The Arena cobra Tri-Swipe goggles have the latest anti fog technology. The mirror goggles are the perfect solution for open water swimmers and triathletes. The unique design allows for optimal vision in the water and the mirrored lenses protect the eyes from glare. No water will penetrate the goggles due to the special 3D Japanese TPE seals giving maximum comfort and a water tight seal, these are the ultimate goggle for long distance swimming. Customise your Cobras for a perfect fit with an interchangeable nose bridge and and adjustable split strap for added security.