Chums Switchback silicone eyewear retainers help you hang on to your sunglasses in any conditions. The Switchback is a one-piece molded retainer that is non-absorbent and stretchy. The temple ends of the Switchback can accommodate a wide variety of eyewear with its two-port design: one port for larger frames and one port for smaller and wire frames. Chums Switchback is UV and corrosion resistant to hold up in any conditions. Available in black fade to smoke color. Adult.