I was super excited to get this bottle as the description mentioned it could be used for hot and cold beverages, much to my surprise it stated in the instructions not to use for hot liquids. It does keep my water cold for a good period of time, but it seems like you have to suck pretty hard to get the water to come out and it makes a high pitch sound when you drink. It has a great locking feature which is nice, no more accidental spills in the car!