Die-cut, wrap-around, curve design gives distortion-free viewing and less eye fatigue. Made from shatterproof, ballistic, selenite, polycarbonate that protects your eyes from harm but is lightweight and comfortable to wear. Tough, triloid nylon framewithstands the rigors of daily wear. Exceeds ANSI Z87.1 and Z80.3, plus Mil-STD-662 fragmentation safety standards. Saber Glasses have a 3mm lens gives enhanced protection against fragmentation. Adjustable, neoprene rubber tipped temples along with rubber nosepiece provide a comfortable fit for all day wear. Meets MIL-PRF-31013 ballistic standards, and ANSI Z87.1-2003 impact certification.