Imagine you're at work, its over 100º and you are required to work outside all day. The last thing you want is to drink from a water bottle that is going to provide warm ambient temperature water. You are THIRSTY and need to be REFRESHED! You wouldn’t drink a frozen slushy when working outside in the 32º winter! So don't drink warm water on a day when you need proper cool refreshing hydration. FITCHUG water bottles will always deliver cold water when you need it and yes even hot liquids when you want those too.