The manufacturer of Cablz calls them "the next generation" in eyewear retention. I came across these retainers at the Summer Outdoor Retailer Show in Salt Lake City. There I had a chance to talk with the owners about their products. They were nice enough to give me a sample to test out. They put them on my glasses, and I haven't taken them off. They are so lightweight you don't even feel them on. As you can see in the picture below, the retainer doesn't even rest on your neck when wearing the glasses.