The 100% RX Eyewear Carrier is a prescription insert that clips inside a Speedcraft or S3 frame. It suits riders who need corrective lenses and want to keep using proper cycling eyewear rather than riding in everyday glasses. The carrier mounts behind the main lens, so you keep the full coverage, venting and retention of the original frame while your optometrist glazes the insert to your prescription. That means one set of frames handles both your vision and the wind, dust and glare protection a shield lens provides. Key features Fits 100% Speedcraft and S3 frames Takes standard prescription lenses fitted by your optometrist Retains the frame's original coverage and venting Removable, so the frame still works with contacts Lenses are not included. Take the carrier to your optometrist to be glazed.