Mariner RetainerJust like a true mariner, the Mariner Retainer is made to live on the water. Built from high strength braided monofilament fishing line, its tough enough to handle any adventure. The stretchy silicone ends grip most frames securely, so your glasses stay put during long days afloat. Made proudly in the USA, this retainer is your trusty sidekick for both saltwater and freshwater journeys.