X-Factor 4, Yellow Lens Eyewear, Semi Rimless Dual Lens Design Conforms To The Fact For A Contemporary Look, Soft Nosepiece and Adjustable Temples Allow Maximum Flexibility and Comfort, Hard Coated To Resist Scratching, XF4 Meets ANSI Z87.1, ANSI Z80.3 and CSA Z94.3 Industrial Safety Standards.