The revolutionary anti-fog technology of arena swipe anti fog technology lasts 10 times longer and can be renewed simply by wiping the lenses with your finger. Gently wipe the inner lenses with your fingertips while the goggles are in the water, making sure the lenses are not dirty while performing this process. Each time you do this while your lenses are fogged up, you ensure excellent visibility with long duration. The curved shape of the lenses ensures greater peripheral and overall visibility.