This 2-in-1 tumbler easily converts from an on-the-go cup with straw to a hot/cold 360 degree tumbler. 18/8 stainless steel double wall insulation keeps beverages hot or cold. On-the-go cup has screw top lid with straw for cold beverages on-the-go. Hot/cold tumbler has 360 lid so you can drink from any side. On-the-go lid and straw are made from BPA-free Eastman Tritan™ copolyester. 360 degree lid is made from BPA-free polypropylene. Dishwasher safe (top rack), hand wash recommended.