Link 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. 100% A&B UV protection protects your eyes from harmful aging and burning UV rays. Optically correct which means no distortion. Optically correct lens are crucial for long wear and accurate vision. Pleasure Ground uses long lived and supremely wearable Grilamid for all their injected frames. "Base" has to do with the amount of curvature a lens has. These 8 base lenses provide complete coverage and great frame fits. Pleasure Ground sunglasses are available for prescription. Comes with microfiber bag. Sunglasses are the most widely available ophthalmic devices sold over the counter that are regulated by the FDA. THIS IS A CLOSEOUT SPECIAL, QUANTITIES ARE LIMITED. Look fantastic, protect your eyes, and get the best vision. All for an unreal price.