Pleasure Ground Tonic Sunglasses combine durable TR-90 frames with premium five-layer polycarbonate lenses. Polarized lenses cut glare while 100% UV protection shields your eyes. Optically correct design ensures clear vision, and the 8-base curved lenses offer complete coverage. Includes microfiber bag. Prescription options available. Tonic 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 Please contact us to inquire about the RX program Comes with microfiber bag Sunglasses are the most widely available ophthalmic devices sold over the counter that are regulated by the FDA