Material: Nylon With Neoprene Cotton. Package Included: 2 x water bottle holder.Dimensions: 500ML, Height: 7.28 in, Diameter:2.67 in. suit for 17 oz. water bottle. Tips: Please be sure to check the bag size (measured by different ways, small error is allowed).Structures: It has a small strap so you can wrap around wrist or just carry from that, it is also very smooth and light weight. They are a bit stretchy and the rim of the sleeves hugs the bottle just where it curves in at the top.But it does fine in washing machine with regular laundry.Application: Lightweight and comfortable insulated neoprene cover, keep the temperature of drinking also can avoid to burn your hand. Fully protect your bottle surface from being scratched, scraping, extrusion and so on. It also fits in your backpack, which you carry with you when traveling. And the handle/strap is great and makes carrying easy.Features: It will keep your bottle from sweating while protecting the bottle and keeping the beverage inside cold for a period of time. Moreover,these are great fit snug dont fall off and you can change the color of your bottle whenever you want. So this is a good product for anyone who wants to use glass bottles. Not only does it help you keep a hold of the bottle, it keeps it cool.