Convenient because the hook allows you to attach it where you want it Convenient because the hook keeps the cloth where you clip it Convenient because the sewn-in cloth design means you'll never lose your micro-fiber lens cloth again Photographers and sportsman alike spend substantial amounts of money for their optics. Every angler wearing polarized glasses may find a time when there glasses get wet or dirty. Spudz was developed for active people who care about their optics Spudz Cleans: Glasses and Sunglasses, Binoculars and Scopes, CDs and DVDs, Ski Goggles, Camera Lenses, Computer Screens, Smudges from Photos