Stainless steel vacuum insulation keeps beverages hot or cold for hours. Heat retention: 189°f @ 1 hr./ 160°f @ 6 hrs, cold retention: 46°f @ 6 hrs Stopper disassembles for thorough cleaning 2-Step lid release process prevents excess condensation on the stopper from being flung off while the lid opens Easy-to-clean double layer nonstick Coated interior enhances durability, and provides greater protection of the stainless steel against salt-containing beverages like sports drinks Safety lock to prevent the lid from opening accidentally