I ordered one 4 years ago & use it daily at work. I ordered a 2nd one to use during gym workouts. Bottom line, for a product that doesn't have an electrical cord attached to it, it keeps cold drinks cold, hot drinks hot... a lot longer. My description is simplified because I've researched this bottle years ago where people have experimented the temperature of the bottled liquid in the fridge, out in the snow, etc. I'm ordering my 3rd one because I foolishly decided to try a "regular" non-insulated miir bottle. Bad idea: the cold drinks did not stay cold and it heavily sweated on the outside of the bottle needing constant wiping.
This insulated bottle is amazing, keeps the liquid cold/hot, no moisture sweating, and the bottle feels room temperature to touch.
This review was written in the old system and had content requirements that are different than reviews written today.