The inner valve ensures liquids won't spill even if the tumbler is accidentally tipped or dropped. Thermalock™ double-wall, vacuum- insulation keeps drinks cold up to 14 hours. Easy to clean - Body, lid, and straw are top-rack dishwasher safe. The straw can be disassembled for full-access cleaning. Fits most car cup holders. Straw tumbler – for easy sipping on the go. The Contigo No-Spill Tumbler is the perfect fusion of trendiness and practicality for those who expect more from their everyday drinkware. Designed to make a statement, this tumbler features a sleek and stylish look that effortlessly complements your on-the-go lifestyle. But it is so much more than that. The tumbler boasts innovative spill-proof technology, keeping your bag safe from leaks and spills. Thanks to the special inner valve in the straw, not even a single drop can escape if the tumbler is accidentally tipped or dropped. Whether you are at the gym, on a commute, or out for a casual stroll, this tumbler ensures your drink stays refreshingly cold for up to 14 hours, thanks to the double-walled Thermalock™ vacuum insulation.