Stainless steel vacuum insulation keeps beverages cold for hours; Cold retention: 48°F @ 6 hrs. Made for cold only; Drinking straw pops up when lid is opened and makes it easy to drink without tilting the bottle 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 Lid and straw disassemble for thorough cleaning Safety lock (clip-type) to prevent the lid from opening accidentally