Product Specification: 17.5*7.5cm Compatible with helmets goggles and face shields. Good breathability and see-through windproof and dustproof. Sports glasses with double lens design anti-UV anti-snow and anti-moisture. Adjustable bike mirror non-slip universal high-elastic strap adaptable to any size headgear. Typically enclose or protect sunglasses the environment around your eyes to protect you from water wind sand or dust. You can use it while walking cycling and running.