These glasses straps are designed to keep a tight grip on your glasses or sunglasses when they fall by keeping them secure around your neck. Allowing sunglasses to be comfortably hung on your chest, or rest on top of your head when not in use. Non-toxic quality neoprene is soft and stretchy. Fit most of eyeglasses, sunglasses, reading glasses, sport glasses, optical eyewear and spectacles. 16 1/2'' L x 4/5'' W