It says the coldest water right on the bottle and it’s true! My husband filled this up and took it in the car with us yesterday leaving it in the car between errands. Well he forgot it and today we got in the car to find it still had ice in it after sitting in the hot garage all night. I’m very impressed! I feel like this is the closest you can get to the coldest water without your water turning to ice! I do wish they made a bigger version, if they ever do I’ll be the first to buy!

Review by on October 11, 2015