Meets Gl-pd 10-12 Mcep Standard, Superseding Mil-prf-31013 Ballistic Standard. Patented Adjustable Saber Temples Can Be Customized For Length Or Replaced With Tactical Strap. 3.0mm Selenite Polycarbonate Interchangeable Lenses For Distortion Free Clarity. Ultra Foam Brow Bar Prevents Debris And Sweat From Entering Field-of-view.