Transparent and soft PVC frame, close stick to face, defend chemistry Indirect ventilated design, wear more safety Elastic rope fit for all people Scratch and impact-resistant polycarbonate lenses Special mercury layer protect against UV and other hazard rays (choice) Anti-fog coated lenses for chemical and medical purposes Can wear glasses inside Various color lenses are available Colors specifications: Gray: outdoor, block over UVA and UVB Clear: general purposes Yellow: night driving and pilot, light sight Red: special UV mixed and anti-laser rays Orange: soft sight, filtrate electric wavelength and infrared ray Mercury layer: protect against giddy, intensity light and astigmatism Should be used in conjunction with machine guards, engineering controls and personal safety practices Conforms with EN 166 and ANSI Z87.1