This water bottle is perfect for keeping my beverages cold for long periods of time. They say 24 hours but honestly I don’t have my drinks sitting in the bottle for 24 hours so I can’t really tell you. What I can say is that no matter how long my beverage is in the bottle – it is cold. It is great for my new diet and making sure I drink plenty of water all day long, every day. It is always cold and always available.5 Stars – does what it says it will do and well4 Stars – mostly does what it says it will do but falls short in some areas3 Stars – doesn’t do a good job at what it claims it will do; poor quality2 Stars – product failurePlease feel free to ask in the comment section and I will try to respond. If my review has been helpful for you, feel free to let me know and I will continue to help people make informed purchasing decisions. Enjoy your day! Review by The Stuff of Success on January 10, 2016