New to the Cablz line, the Cablz Zipz have all the benefits of the popular original version, but are easily adjustable for a custom fit. With a simple pull on each of cable guides the length is shortened for a snug or looser fit; whatever your preference. The guides place enough tension to keep your eyewear in place, but also allows for easy no hassle removal. They could be the most versatile and hassle free eyewear retainers on the market.