MONOFILAMENT-LIKE LINE (XL ENDS) - A single piece construction is non-conductive. These retainers are perfect for working in the utility industry and more! ADJUSTABLE - Using similar technology to our Zipz, the Monoz are adjustable to fit your head perfectly. Don't worry about looking down, when fully tightened, your sunglasses won't move! OFF THE NECK DESIGN - Our Monoz product is designed to keep your neck and head free of a strap when fully extended. You can turn your head and never feel the Monoz touch your neck. EASILY ATTACHES TO ANY FRAME - Our durable, monofilament cable fits all standard frames with comfort for all head shapes and sizes. DESIGNED FOR DAILY USE - Our lightweight, durable and low profile design makes Cablz easy to use for any activity. Whether you're performing indoor or outdoor activities including cycling, running, or other sports, Cablz provides you with a comfortable wear at all times!