Cablz Zipz (XL Ends)
These glasses keepers are made with black surgical grade stainless steel wire and high-grade silicone ends. Specially designed for glasses with thicker frames. They are adjustable so you can snug them up as tight as you like to the back of your head or wear them comfortably long.
Fits frames with 16mm+ ends and comes in three lengths: small (10"), medium (12") and large (14").