Cablz Zipz Eyewear Retainers
Made of surgical stainless steel with high-grade silicone rubber ends to grip most frames, these popular retainers don't sit on your neck. Plus 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 5-15 mm ends and comes in three lengths: small (10"), medium (12") and large (14").