Lenses are made by premium scratch resistant resin Polarized lens with 100% UVA/UVB Protection Designer hand cut Nylon frames with custom molded metal temples REVO MIRRO Sizes refer to the width of one lens in millimeters and lenses are prescRED POLARIZED LENSES – This Retro Sunglasses is polarized and provide 99% Polarization efficiency while blocking and managing UV and HEV light, delivering a superior visual experience and glare protection. Polarized sunglasses eliminate glare and haze so your eyes are more comfortable and you can see better. Polarized lenses contain a special filter that blocks this type of intense reflected light, reducing glare.