The Asensys filters are specialized sunglasses designed to fit over patients? prescription glasses and provide contrast improvement and all-round protection against the sun and unpleasant glare. This unique tinted red filter has a cut-off transmission of 550 nm and a frame size of XL Large (65-12 mm). The Asensys lenses are made of lightweight CR39 and are available in both polarized and non-polarized versions in each color. The eyewear come in two frame sizes, XL small and XL large, each of which provides top shield coverage above the eyes and side shields on the temples to maximize the amount of protection from side glare. All of the Asensys filters provide 100% UV protection and are prescription correctable. A hard protective case is provided with each pair for safe storing. SPECS: Lens Material CR-39 Optical quality lenses Mount Plastic Frame Size 65-12 mm Rx-able Yes Tint Color Red Wavelength cutoff 550 nm Warranty 1 Year warranty Manufacturer: Eschenbach Model: 1661-9550