The Zefal Z20 Pro 65 bottle was designed to provide the cyclist with the best possible hydration. The fast opening nozzle is made of silicone to made it agreeable to the mouth and allows a controlled steady flow of the liquid to prevent spill. Once closed, it is 100% sealed for an easy transportation. It has a good grip and is made of polypropylene that does not affect the taste of your drink and does not smell.