Zojirushi's stainless steel vacuum insulated Cool Bottle keeps beverages cold for hours. The 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. Drinking straw pops up when the lid is opened and makes it easy to drink without tilting the bottle. Safety lock features prevent sthe lid from accidentally opening. Lid and straw disassemble for thorough cleaning. Wide mouth opening measures 1-5/8” (4cm) for ice cubes. All parts are made of BPA-free plastic and stainless steel.