Road specific Adaptalite photochromic lens formulations for optimal cycling performance. Road formula has 39%-12% light transmission range. Exclusive Specialized Adaptalite lens adjusts to existing light conditions. Lightweight stainless steel frame in a hinged, folding design. Include molded hard case and wiping cloth. NXT lens material is superior in its light weight and shatterproof qualities. Molded Megol nosepiece and ear tabs hold comfortably without slipping.