The I-Dapz Active Eyewear System is more than just sunglasses - it's total equipment for your eyes. It's the only eyewear with interchangeable components, including lenses and arms, that lets you configure 18 different versions from casual driving glasses to streamlined sport goggles. With their Light Equalization System that fine tunes light frequencies for sharp definition and their high tech construction that provides uncompromising durability, i-dapz can deliver 100% UV protection for all types of activities and lighting conditions. I-Dapz are made of durable Transolite, so don't be afraid to handle them and use a little force where necessary to snap the various components together. Clip in Optical adapter ? The optical adapter comes with blank lenses that must be replaced with lenses fitted to your prescription. The optical adapter can be fitted with prescription lenses for most people, however people wearing bifocals or requiring very strong corrective lenses will not be able to use the optical adapter. Shipping is FREE!!! ALL ORDERS ARE SHIPPED VIA FIRST CLASS AIR MAIL! We ship out daily. We proudly accept PayPal. Contact us if you have any questions.