Ready to join the adventure with bold style, Native Eyewear's Bigfork Sunglasses feature N3 polarized lenses for outstanding infrared light protection, acuity enhancement, and impact resistance. Interchangeable SportFlex lenses are included for low-light conditions. . Best fit for a large to extra-large profile. N3 Polarized Gray lenses suitable for extremely bright sunlight; offer for all-around protection; maintain color saturation and natural contrast. 13% VLT (Visible Light Transmittance); the lower the number, the darker the lens. N3 Polarized Lens Technology:~ Blocks up to 4x more infrared light than regular polarized lenses, decreasing eye fatigue and reducing the likelihood of dry eyes~ Delivers high contrast, crisp definition, and peak visual acuity by significantly reducing blue light and selectively filtering UV for protection up to 400 nm~ Provides superior impact resistance for durability and protection to the ANSI Z87.1 standard. Optical-quality polarized carbonate lenses provide 100% UV protection and eliminate glare from water, sand, pavement, ice and snow for sharp, clear vision. Includes interchangeable SportFlex lenses for low-light conditions with 60% VLTideal for cloudy or overcast skies, dusk and dawn. Single Snap-Back interchangeable lens system: Designed to utilize all Native lens options so you can adjust to varying light conditions (SportFlex lenses included; additional lens kits sold separately). High-performance thermoplastic Rhyno-Tuff Air Frames provide lightweight durability to withstand high-velocity collisions and temperature extremes. Co-injected molded temples seamlessl.