Keeps cold up to 72 hours and hot up to 48 hours. Double-wall vacuum insulation, high-quality insulated layer and narrow mouth help to hold the desired temperature. The outer part of the thermo water bottle has a copper top coating to keep coffee and tea hot, while iced water is kept cold.18/8 high grade rust-free stainless steel metal bottle. BPA-free, food-grade steel, food-grade plastic and silicone. Stopper has extra metal layer to prevent odor absorption. Your drink will never touch any plastic.External cap doubles as a cup for your beverage. Extremely easy to open and close ergonomic shape of the lid helps to avoid any accidents or spills.Dishwasher safe. Easy to clean. Durable and shatterproof hydro bottle.