Crossfire Eyewear 21427 ES4 Polarized Safety Glasses with Silver Mirror Polarized Lens and Black Frame Designed for all environments, the ES4 features an adjustable nosepiece, ultralight frame and 100% visually correct lenses Frames are designed at an 8 to 10 base curve resulting in maximum side coverage and superior peripheral vision 99.9% protection from harmful UVA and UVB rays Lens quality and performance meet and exceed ANSI Z87.1-2003 high impact standards Frames and temples made of highly durable, ultra-lightweight, flexible and impact resistant material