Ceramic-Lined: Made of double-walled, premium stainless steel with ceramic-lined interior to preserve flavor and keep beverages hot or cold for hours Leak-Proof: Comes with a lockable, push-button straw lid that is 100% leak-proof. This product also comes with a fitted interior straw that locks into the lid and was designed specifically for this vessel. It also comes with a clear straw used in other Simple Modern products. The straw lid is not recommended for hot or carbonated beverages Elevated: Features a wide handle for comfortable grip, and a silicone base to soften contact and enhance stability BPA-Free & Dishwasher Safe Limited Lifetime Warranty & Pat/Pat Pend