Ounce for ounce, the Main II Gain Spark Goggles are arguably the best value on the market. The proprietary Spark lens features a mirrored finish which helps to improve visibility and reduce glare in bright sunlight. With a feature set that rival goggles twice it's price, the performance is improved even more with the addition of the FOX VLS (Variable Lens System) which allows for easy upgrades via the transfer of both standard and injection molded lenses within the same frame. With an expansive viewport, triple-layer foam and dependable Lexan® lens and tear off lens functionality, they are a heavy hitter and light on the wallet.