TRIPLE INSULATION TECHNOLOGY: Each 64Hydro tumbler has double-walled, vacuum-sealed and copper-coated insulation, which helps keep drinks cold for up to 24 hours & hot for up to 12 hours. CONSTRUCTED OF 18/8 STAINLESS STEEL: Known for its strength and purity, our 18/8 food-grade tumbler won’t break, rust, retain or transfer flavors. Unlike other tumblers, our tumblers provide a clean, non-metallic taste. ANTI-LEAK, BPA-FREE FLIP LID: Each tumbler comes with an Anti-Leak, BPA-Free flip lid. The lid will prevent any accidental spills. Anti-glug hole ensures the smooth flow of water and a comfortable drinking experience. NO SWEAT, NO PROBLEMS: Our copper wall layer creates a condensation-free exterior that won't sweat on your hands or in your bag BPA FREE: Sip healthy with our BPA-Free tumblers that are made without phthalates and toxic materials. 100% CUSTOMER SATISFACTION: We value every customer response and offer friendly customer service. In any case you are unsatisfied with the purchase of our product, just feel free to reach us. We are willing to help you in every possible way. We sincerely hope you could enjoy the purchase and enjoy your life carry with our tumbler. Finally, it comes in a variety of stunning PRINTED ARTWORK. Come to choose a design for yourself!