Chums Switchback: 

The new Switchback Silicone Eyewear Retainer is a one-piece molded retainer. The temple ends can accommodate a wide variety of eyewear via its two-port design: one port for larger frames and one port for smaller and wire frames. Available in a wide variety of colors.

Details

• Non-absorbent and stretchy
• Top port fits wire frames
• Bottom port fits standard and large frames
• UV and corrosion resistant
• Multiple attachment options both right side up and upside down
• Length: 17.5"
• Weight: 0.5 oz.