The double-wall vacuum insulation keeps your beverage at the ideal temperature. It fits comfortably in your car, boat, or truck. The Rambler Cup is designed with 18/8 stainless steel and is sweat-free, providing you extreme durability and long-lasting use. Featuring tritan copolyster and silicon construction see through lid. Don’t worry about spills and leaks with the crystal clear lid. Capacity 20 oz.