OveRxCast is a polarized sunglass designed to be worn over prescription glasses. They are available in three patented frame sizes, so most people can find a size that fits over their prescription eyewear. The frames are designed to completely isolate the eyes from the elements, blocking 100% of harmful UV rays and completely eliminating glare. These over glasses are extremely popular with fishermen and outdoorsman. OveRxCast is available in polarized gray, a neutral tint that delivers natural color definition ideal for bright sunny days, amber which sharpens visual acuity, improving depth perception and contrast in variable light conditions and copper that delivers the brightest field of vision to heighten visual acuity and improve contrast in flat light conditions. Key Features: Durable and comfortable frame fits over prescription eyewearComfortably fit over 98% of prescription eyewearPolarized UV 400 scratch resistant lenses to eliminate glare, and provide 100% protection from harmful UVA UVB rays.360 degrees of protectionFrames feature underside protection to eliminate reflected light from entering the eyes from below Size guide: Medium fits Rx Frame up to 5 14 x 1 12 133mm x 39mm MEDIUM LARGE fits Rx Frame up to 5 716 x 1 38 138mm x 36mm LARGE fits Rx Frame up to 5 716 x 1 78 138mm x 48mm.