Cr 39 lenses that are lightweight?? scratch-resistant and ultra violet protective</br>Lenses are prescription ready</br>Case included</br>Lenses are prescription ready (Rx-able)</br></br>Product Description</br></br>Calvin Klein CK4182S Sunglasses 001 Black</br><br/>http://www.amazon.com/gp/product/B00C3CMK9W