No matter the outside temperature, your drinks keeps hot for 12 hours. Because of our vacuum insulation the beverage also keeps cold for up to 24 hours. All of our bottles are BPA free, non-toxic and safe from dangerous materials. All bottles are FDA & LFGB approved and safe to keep everything from water to childrens food in it. For every bottle sold we reduce some of the single-use bottles from ending up in nature.