BUILT®'s high quality 20 oz. (591 mL) vacuum tumbler maintains the optimal temperature of beverages. Made of double-wall 304 Stainless Steel featuring vacuum-sealed construction. Keeps your drinks cold or warm longer than a traditional tumbler. Includes durable, threadless Tritan™ lid easily slides open and closed for one handed drinking. Hand-wash only. Do not place in freezer. Fits in most standard sized cup holders.