My husband first received a free Chilly’s bottle as a donation to NHS workers. As soon as he bought it home I filled it with very hot water to test if it actually kept it hot for the claimed 12 hours. I am so pleased to say it did. I have tried many other well known brands which claim to keep drinks hot for 6 hrs or 8 hrs and don’t. So I was reluctant to spend even more money and risk being disappointed again. Chilly’s bottles do exactly what they say. So my husband may have had a lovely free gift of a Chilly’s bottle but I have purchased 2 bottles and other family members have also bought them too.