The tumbler features 100% Stainless Steel Double Wall. The exterior has a stylish layer of color to keep it fresh and clean.The lightweight and compact design makes it easy to fit into most car cup holders. Stay 6+ Hours Hot Cold.enough for you to use in your office, at parties, during RV tours, cabin trip, camping, hiking, picnic and so on, filling your double walled tumblers with coffee, sweet tea, beer, ice water, milkshakes, lemonade, soda and more.