Cold to the Last Sip - Matterhorn is prepared to help you handle the heat or the cold. Whether it’s in a hot car, a busy kitchen, Matterhorn will keep your drinks cold for up to 18 hours. (Yes, you read that right). This bottle is also engineered to keep your drinks piping hot for up to 10 hours. So, go ahead and test it out, we know you won’t be disappointed.