I was given one of these as a gift, and honestly thought it would sit in the heap of thermoses that didn't meet my needs. I was wrong! It's stainless steel double-walled and competes with our Yeti in terms of keeping coffee warm for long periods of time. What I like even more is its lid system. The thick walls of a thermos (without the lid) are usually metal (read: hot) and not pleasant to drink from. With the lid on, you're usually forced to drink out of a little sippy hole, which I find annoying. Plus, lids with little flip caps over their openings are ripe for spills. This two piece lid makes hot beverages easy to pour without drips, and more pleasant to drink out of than other lids. Plus, they're sleek and minimal, which I love!