Smith Optics Elite Chamber Tactical Sunglasses with Polarized Brown Lens Frames constructed of lightweight, impact resistant materials Chamber Tactical features Large fit/Large coverage Our Tactical Glasses meet US Military Spec MIL-PRF-31013,ANSI Z87.1 Tapered Lens Technology for distortion free optics- Lenses provide 100-Percent protection from harmful UVA/UVB/UVC