【18 Oz Tumbler】This 20-ounce white vacuum insulated cup comes with a push-on lid that provides maximum splash resistance. It's easy to drink from - just slide the lid open. With a 3.4-inch mouth diameter, it stands at 6.69 inches tall, and has a bottom diameter of 2.79 inches. The surface is sweat-proof for easy gripping and prevents heat transfer to the exterior 【304 Stainless Steel Material Rambler】The interior of our cup is made from high-quality 304 food-grade stainless steel. It's rust-resistant, easy to clean, and incredibly durable. The exterior is made of 201 stainless steel with a white finish 【6-12 Hours Insulation】Featuring double-wall vacuum technology, it keeps hot drinks warm for over 6 hours and cold drinks chilled for over 12 hours.