The insulated tumbler is made of stainless steel and have double-wall insulation, which means your beverage will stay hot at least 12 hours or cold 6 hours. The insulation also protects your hands from the temperature of beverage. The tumbler cup body is frosted and spray-painted, which is non-slip and sweat-proof, and does not hurt your hands. A good ideal for car/vehicle cup holders. Makes an excellent birthday, valentine's day, anniversary or Christmas gift. Suitable for many occasions, you can use the tumbler with lid and straw at home, office, swimming pool, beach, picnic, camping, driving, hiking or other indoor and outdoor areas. TIPS 1. Hand wash the tumblers before first use and after each use. 2. Always keep the tumblers away from children when filled with hot liquids. 3. Please do not put in microwave oven or refrigerator. 4. It is suggested that take off the lid after filling the hot drink for 2-3 minutes to cool down, and then close the lid with slider open.