Durable, double-walled, vacuum-insulated 18/8 stainless steel bottle keeps drinks cold up to 31 hours or hot up to 11 hours High-flow spout allows you to hydrate quickly Button-operated AUTOSEAL feature seals the lid between Sips to eliminate spills and leaks, and a patented slide lock prevents the accidental pushing of the button while you're on the go Protective spout cover keeps dirt and germs off your mouthpiece, and dropdown lid feature makes it easy to clean 100% BPA-free for Peace of mind This product contains Stainless Steel (Iron, Chromium, Nickel, Manganese), Styrene, Formaldehyde, Octamethylcyclotetrasiloxane