XUEMEI provides the solution if you can't go skiing, climbing or snowboarding without your corrective lenses in place (also perfect for motocross and mountain biking goggles) Made from a highly durable TR90 composite, the insert is designed to fit into any adult-size ski or motocross goggle by way of sprung arms that simply clamp themselves to the inside of the lens Corrective lenses up to a strength of plus or minus 4.5 SPH can easily be added to the insert by any reputable optometrist, or we can help - contact us for details Manufactured by one of the UK's leading brand of specialised sports eyewear products Can be used for distance, bifocal and varifocal optical correction Delivery quantity: 2pcs Product color: transparent Product size: 12*6.3CM