【SIZE】The total length of sunglasses strap is about 11.8inch, (Suitable for glasses temple tips with width between 0.33inch-0.52inch.).【Anti-slip Elastic Material】 Made of softest, comfortable material of elastic nylon/spandex. This soft elastic braided rope has great anti-slip effect, allowing it to be firmly attached to the glasses temple..【Adjustable System】The buckle slides along the strap to allow length adjustment, so that the eyeglasses strap will fit on any head shape and size. Great elasticity of the material also makes the length of strap adjustable..【Keep Your Glasses Secure】 Our eye glasses string strap is designed to keep a tight grip on your eyeglasses, preventing the loss of the glasses and breaking during movement or sports such as biking, hiking, skiing, allowing your eyewear to be comfortably hung on your chest, or rest on top of your head..【Fits Most Eyeglasses】 These eyeglass chain fit for myopia, reading glasses, sunglasses, etc. 2 PACK Black can be paired with different styles of glasses and clothes, make you look more fashionable..Own it forever - If there are any problems with your product, please don't hesitate to message us and we'll make it right for you!