[This review was collected as part of a promotion.] I have a coffee or a latte every single morning and while I am getting ready, always find that my coffee gets cold fast. These mugs are fantastic and definitely keep my coffee warmer, longer - as they are double wall insulated. They are so light that you would not even think they would be as insulated as they are. I was very impressed!! And still am while using it daily. It sits flat so I never have a problem with it thinking it will tip or spill some how. They are clear and light but are just so durable and beautiful. I love the triangular shape my drinks have because you just don’t expect it. It’s like a trick that plays with your mind and it’s fun! It’s also great that they are actual glass because I like drinking out of them better. I can’t wait to use these in winter for hot chocolates. These are so perfect!! As soon as my coffee was poured in hot, they were not hot to the touch and that is something I like a lot. I definitely recommend!