Travel tumbler features dual walls with vacuum insulation, Keep drinks hot and cold longer for a more enjoyable drinking experience. Travel mugs are made of 304 stainless steel. Electropolished inside. The lid is made of AS, chemical-free. It comes with a removable rubber gasket. Wide mouth design and Drink hole on the top for easy washing. 24oz travel Mug lightweight and compact feel make it easy to fit into most car cup holders. Carry around your beverages whether on home, office, picnic, hiking or camping adventures.