It's going to be huge. No. Monumental. No. Legendary! The Wiley X WX EPIC WorkSight eyeglasses deliver a trendy style while still checking all the critical protective boxes. The frames meet the ANSI Z87.1 safety standard for high-velocity/high-mass impacts when the optional removable side shields are installed. If you're looking for a single eyewear solution for work and play, look no further than the WX EPIC. Shatterproof Selenite™ Polycarbonate lenses that meet ANSI Z87.1 high velocity and high mass impact standards, as well as US Federal OSHA 1910.133(b)(1)(1) standards when removable side shields are equipped Hand-polished, durable Triloid™ nylon frame Removable side shields are included to provide lateral protection on the job. Permanent side shields are available Prescription Ready Fit (Head Size): Medium Measurements: Bridge Size: 17 mm Lens Width: 55 mm Lens Height: 38 mm Temple Length: 145 mm Compliance: Meets ANSI Z87.1 high velocity and high mass impact standards, as well as US Federal OSHA 1910.133(b)(1)(1) standards when removable side shields are equipped