Pack of 4 Adjustable Floating Foam Eyewear Retainer Holder Sports Sunglass Keepers Eyeglass Holder Safety Strap Rope The strap is simple to use, soft and durable, and it will keep your glasses and sunglasses look fashion Comes with adjustable loops on the strap cord to ensure that the strap will not easily fall off and to make suitable adjustment for the convenience of your head in any sizes and shapes. Outside is nylon material and inside is filled with foam Good for sunglasses eyeglasses outdoor or indoor sports, travel etc. Strap size:12x0.5inch (LxW),Silicone tube size:2.25x0.2 inch