The Cobra Core’s design features the same incredible hydrodynamics and extended lateral vision as the Cobra Ultra in a comfortable and streamlined design and provides impressive forward visibility and speed in an aggressive design utilizing greater lens depth for enhanced comfort and eyelash clearance. Now with the most advanced anti-fog protection ever! arena’s new Swipe Anti-Fog Technology extends the life of your goggles by restoring the anti-fog protection to pristine condition. How to use Swipe: When goggles become foggy, activate the revolutionary Swipe anti-fog protective film by gently swiping the inner lenses five times with your fingertip while the goggles are in the water.