District Sunglasses deliver polarized vision with durable TR-90 frames and five-layer polycarbonate lenses. Features 100% UV protection, anti-scratch coating, and optically correct design for clear, glare-free viewing. Includes microfiber bag. Prescription options available. Pleasure Ground&';s first single 6-base shield lens District Sunglasses are made with Ultra-Lite injection molded TR-90 unbreakable nylon TR-90 will not lose its shape in the most extreme temperatures and was developed for its properties of strength, flexibility and memory retention Premium-quality polycarbonate lenses are constructed in five layers and are 2.0mm thick Polycarbonate is ultra-lite and unbreakable with anti-scratch hard coatings applied Polarized lenses significantly cut glare and reflections for an all-around more soothing viewing experience Optically correct which means no distortion Optically correct lens are crucial for long wear and accurate vision 100% A&B UV protection protects your eyes from harmful aging and burning UV rays Base" has to do with the amount of curvature a lens has These 6 base lenses provide complete coverage and great frame fits Comes with micro fiber bag Pleasure Ground sunglasses are available for prescription Please contact us to inquire about the RX program Sunglasses are the most widely available ophthalmic devices sold over the counter that are regulated by the FDA