Product Detail:  Eye Size (UPLC Rx Insert): 41 | DBL: 24 Head Size:  Small to XXLarge Includes the following: Matte Black Frame Smoke Grey Lens Clear Lens Tactical Case with Clip Microfiber Cleaning Cloth Anti-Fog Wipe Rubber Tipped Leash Cord Instruction Card Product Features: APEL Approved Shatterproof Seleniteâ"¢ Polycarbonate Lenses that Meet the MIL-PRF-32432(GL) Ballistic Standards. ANSI Z87.1-2010 High Velocity and Mass Impact Standards, and EN-166 FT High Speed Particles at Temperature Extremes 100 Percent UVA/UVB Protection With Distortion Free Clarity T-Shellâ"¢ lens coating resists scratching in extreme environments Foilâ"¢ Lens Coating Provides Anti-Fog Protection Additional Lens Tints Sold Separately for Varying Light Conditions Smoke Grey Lens Provides Max Glare Reduction with No Color Distortion: Light Transmission 15% Clear Lens for Night, Indoor, Overcast, and Very Low Light Conditions: Light Transmission 90% Universal Prescription Lens carrier (UPLC) Compatible Assigned National Stock Number [NSN 4240-01-630-7493] Standard issue to the US Amerd ForcesWiley X