Made from durable neoprene in black colour this Extra Large size Gripper (retainer) is purpose designed to fit sports sunglasses & eyewear that have wide / thick ends to the temples (frame arms). It simply attaches to the end of frame arms / temples and will ensure your  sunglasses / eyewear don’t fall to the ground (and scratch the lenses) or, if you are on a boat, disappear over the side. The further up the frame arm you push it the tighter the  eyewear will fit. This makes them highly effective in preventing your eyewear from slipping down your nose when you perspire.