Client glasses ,can wear myopic inside Eyebrow and side shields coverage design for protects against granule and sandstone from the upside and sides Four fore-and-aft adjustable positions for individual face All PC material without metal parts.more safety Ventilate leg fit for long time use With rope hole in glasses leg, agile and convenience Scratch and impact resistant Polycarbonate Lenses Black , Navy Blue and Red, different color choice for frame Special mercury layer protect against ultra violet and other hazard rays(choice) Anti-Fog coated lenses for chemical & medical purposes Different color lens for different purposes: Grey: outdoor. Block over UVA&UVB Clear: general purposes Yellow: night driving and pilot, light sight Red: special UV mixed. anti-Laser rays Orange: soft sight. filtrate electric wavelength and infrared ray Mercury layer: protects against giddy light, intensity light and astigmatism Strongly Conform with EN 166 and ANSI Z87.1 Should be used in conjunction with the the machine guards,engineering controls and sound manufacturing and personal safety practices