The 30-oz. Urban Peak Trail Tumbler has a copper-lined, vacuum-insulated deep draw liner that maintains optimal drinking temperatures and provides 10X heat retention. It features: Stainless Steel dual-walled construction. Lead-free vacuum seal. Screw-on, spill-proof AS plastic with unique flip top design and Tritan snap locking closure lid. Keeps ice for over 48 hours. Sweat-free design. Powder-coated finish.