Chi Omega Big Sister 16 oz Signature Tumblers with Lid Chi Omega 16 oz. thermal insulated tumbler; Reduces sweating. Dishwasher safe Officially licensed Chi Omega logo on a red and white chevron background, comes with matching lid. Double-wall construction creates thermal barrier that insulates beverages Unbreakable clear polycarbonate - same material used in bullet-proof glass - holds up to daily use Made in USA with Signature Tumbler's lifetime replacement warranty.