Does the trick - Eagle Optics Binocular Rainguard

I bought this for my Nikon ProStaff S binoculars to replace the free-floating ones that came with he binocs (which I can never find). These are tight-fitting at first but expect they will loosen up a bit with use - they certainly won't fall off. I attached a key-ring type O ring to my binocs, since I use different straps with my binocs. Sturdy and expect they will last a long time.