Trek tumbler has stainless steel outer shell with black polypropylene inner lining. Keeps beverages hot or cold for up to three hours. Features wide-mouth that is 100% BPA-free Tritain ™ plastic. Tumbler comes with a metal straw and a flexible, food-grade silicone straw sleeve that slides over the metal straw. The straw sleeve color will match the color of the tumbler. **Hand Wash Only*