The 3M™ SecureFit™ 3700 series of glasses was designed to protect your prescription glasses from scratches and damage; adjustable ratcheting side arms allow for an easy, comfortable and secure fit; models with a contoured brow guard rest comfortably on your forehead and help provide additional eye protection against dust particles; the glasses are lightweight and comfortable even during strenuous active work; polycarbonate lenses absorb 99.9% of UVA and UVB rays and provides aslo Anti-scratch coating