Sawfly US Military Eyewear System (clear,solar lenses, head strap, microfilber pouch, case, anti-fog cloth) High-impact protection certified to ANSI Z87.1 and Military Requirements (MIL-V-43511C clause 3.5.10 and MIL-PRF-31013 clause 3.5.1.1). Optically correct curved lens for unrestricted field-of-view. Interchangeable lenses for various light conditions - Clear & Smoke. Polycarbonate lenses offer 100% protection from UV-A, UV-B and UV-C rays. Adjustable arms ensure perfect fit. Large: Fits head sizes 7.5+. Regular version fits most heads. Retention head strap provides security. NSN 4240-01-527-4018 Large Black NSN 4240-01-527-4051 Regular Black