The Bolle X9 Ski/Snowboard OTG goggles are designed to fit over most prescription glasses. * Flow-Tech Venting designed to reduce fogging and optimize the flow of air over the inside of the lens. The state of the art venting not only controls airflow, but prevents clogging from ice and snow. * Double PC Vented Lens - The Bolle unique double lens design creates a thermal barrier, while providing exceptional optics and a superior seal. * P80 Plus/Carbo-Glass is the proprietary Bolle technology which is applied to the polycarbonate lenses - it provides maximum protection against fogging and scratching. * Triple Layer Face Foam is micro-soft on your face, and backed with two layers of dual density foam for a firm yet soft fit.