The most innovative lid in its price segment, 100% BPA Free, Underside seal design guarantees 100% reliability and eliminates "coffee nose" caused by lower quality flip lid designs, Double-wall vacuum-insulated stainless steel keeps beverages hot or cold for hours, Unique reservoir spout delivers more flow control and releases more of a beverages aroma while drinking, Lid pivots open for easy cleaning and is top-rack dishwasher safe