Made of single-ply woven polyester. the Classic retainer offers a super sleek take on the best-selling Original silhouette. This no-nonsense style features an adjustable bead to customize your perfect fit and stretchy cotton fabric that will fit over a wide variety of frames. What does this really mean? Maximum security for your shades in a clean. updated style that will compliment your next adventure. Whether you're out for a casual day or hitting the trails. this retainer is designed to perform.