STAY TOGETHER 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. Turn the retainer upside-down for an off-the-neck look. Available in a wide variety of colors. FEATURESReversible dual port retainer.Top port for small or thin frames.Bottom port for large or thick frames.Fits over temples with rubber inserts.Low thermal conductivity, chemical reactivity and toxicity.Does not support microbiological growth.Resistant to oxidation, ozone, and UV light.