This BYO double wall tumbler is the perfect solution for bringing hot or cold drinks on the go. This tumbler is made of 18/8 stainless steel with a durable, thread less, spill-resistant, Triton lid that easily slides open and closed for one handed drinking. The double-wall design maintains the optimal temperature of beverages, keeping your drinks cold for 24+ hours, hot for 8 hours. Sized to fit in most standard cup holders. Bp-free and holds 30 ounces. Hand-wash with warm water and a mild detergent; rinse and dry immediately.