Made of 18/8 stainless steel and keeps beverages hot for up to 4 hours and chilled for up to 18 hours. The double wall feature also prevents condensation, retaining the temperature of your beverage inside the bottle. Just perfect for daily drinking at home, taking walks, and sipping at the office. Its clear lid lets you check your drink status in a flash. Need a refill? Only takes a second to check! We highly recommend hand wash, but can be top rack dishwasher safe. NOT microwave safe. This tumbler fits snugly in all standard cup holders, making it the perfect choice for coffee or tea on early-morning work commutes, long road trips, and boat excursions. This Double Wall Stainless Steel Tumbler makes a great gift for everyone in your life. Don't know what to get, look no further!