Lincoln Electric Safety Glasses | Fits Over Prescription Glasses | Adjustable Frame| Clear Lens |K2968-1 FITS OVER PRESCRIPTION EYEWEAR  Special lens and frame designed to be worn with or without prescription glasses. IMPACT RESISTANT LENS  Meets ANSI Z87+ and CSA Z94.3 compliance testing for impact resistance. ADJUSTABLE LENGTH FRAME  To provide a comfortable, secure fit, the frame length has easy to use slide adjustments. SUPERIOR COMFORT  The high strength plastic frame has soft, flexible rubber accents to provide all day comfort. SIDE PROTECTION  Large, impact resistant lens has integrated side shields for peripheral eye protection TRUSTED BY PROFESSIONALS  These safety glasses are used by professional fabricators on a daily basis.