Chums hit a home run ! Ok so I’m charter Capt./ tournament fisherman On the water nearly every day for 25+ years & I see new products come & go a lot , The new Chums Tideline retainer is absolutely awesome! Every now & then a company comes up with a revolutionary idea to enhance a common product, chums has done just that with the new Tideline retainer. With the silicone temples( won’t crack or break like rubber) & new interchangeable retainer with the new harpoon tips. All you need are multiple temples on all your glasses & just one retainer! What a genius idea! Love mine as I need several different sunglasses lenses depending on water & weather!