You made an investment in your Sunglasses and don't want to lean over the side of the boat or pool deck and have them slid off your nose. Plop as they disappear beneath the water. Secure your sunglasses with National Geographic's Sunglass Strap with National Geographic Logo. Easy to install and will keep your Sunglasses Safe and Handy. Sunglass Strap is made from Soft Black Neoprene Rubber, just slip ends of your sunglasses into the stretchy neoprene rubber for a secure fit. Keep track of your shades, even when your hands are full. Sunglass Strap is covered by a 24 month limited warranty.