You know how I know this really works? I take it to work every day and as I pull my laptop bag out of the back of the car I usually set this on the roof. Bright color so no way I could forget it. Well, not once, but twice, I did leave it on the roof. The first time I recalled at lunch so it was only on the car for 5 hrs or so, however, it was already 88F by the time I got it and the liquid inside was still cold. I'm not an ice fan so it was only tap cold to begin with and it held temperature. The second time I left it on the car all day (9hrs). That time did have ice to start and while it wasn't still filled with ice, there was ice remaining and clearly the drink was still cold. This was a 93F day. These really do hold the temperature. They seal great (Although can be a little difficult to open at times) and I'll use nothing else. Great products overall and this one is a winner!

I never leave home without it!

Cold all day long

Keeps my aminos cold all day long - love it!

When I got this water bottle in the mail i’m not kidding when I say my fiancé tried to steal it from me. He literally tried to take it with him when he left my house. So if you want a hydro flask dupe without the price 10/10 recommend. But if you don’t want trust issues with your friends and family you might need to find a lower quality water bottle.