DOUBLE-WALLED VACUUM FLASK: Double-walled Vacuum insulated technology keeps beverages hot or cold for 12 hours. Inner coating for better temperature retention. A unique bottle that makes pouring completely hassle-free and spill-free, rust proof. LEAKPROOF & SWEAT-FREE: No condensation on the outer body, even when carrying icy cold water, remaining completely sweat-free. Leak-proof & non-toxic: leak-proof design, contains no toxins, completely BPA and phthalate-free. CLEANING AND MAINTENANCE Suitable for dishwashers, although for better preservation of materials (especially the cap), we recommend hand washing with soap diluted in warm water. Store uncovered and empty. Not suitable for the microwave. Do not freeze. Material: Double-wall stainless steel material. Double-wall vacuum gift set. Double-wall flask comes with 2 steel cups in box packaging, made up of high-Quality material. Box Packing