A sophisticated combination of retro and modern tastes, our Obsidian Fort Knocks Rx sunglasses and eyeglasses check all the boxes and then some. Prominent black-to-clear gradient shading on the fronts mirrors your smooth finesse, while black arms and inner transparent accents offer a nice mix of playful and fashion-forward. Choose sunglasses lenses for full UV400 protection and impact resistance for any forays into unexpected fun. Catch some eyes with dark chrome accents on the front, and don't forget to show off the fancy arm script to anyone in need of some style guidance. Front frame fades from black to clear at the bottom Glossy black arms Silver hardware Single vision or progressive Lenses available in a variety of colors All sunglasses lenses are polarized Digital lens technology offers sharper image quality and enhanced contrast Correction available in -6 to +3* Astigmatism correction available to -4.00 Pupillary distance available in 57-80mm** Scratch resistant coating Anti-reflective coating FDA compliant impact-resistant polycarbonate lenses UV400 protection Lightweight Unisex Hard shell case and microfiber pouch included Prescription eyewear is available for U.S. customers only *Correction available may vary per prescription and frame style selection. Our technicians will verify your eligibility before your order goes to production and will contact you with any issues. **Some PD restrictions may apply on specific frames. A large disparity between customer PD and frame PD will increase thickness of final product.