18-ounce travel Thermos made with ultra-durable stainless steel; insulated for maximum temperature retention * Designed to keep hot beverages hot and cold beverages cold for hours; great for work, school, car trips, or camping * 2-1/2-inch-diameter bottom fits most vehicle cup holders; comfortable non-slip rubber grip and sweat-proof design * Sip-hole cover flips open for no-spill sipping; fine threading ensures twist top seals tightly * Hand washing is recommended; comes backed by a 5-year warranty against defects