The Contigo AUTOSPOUT bottles are equiped with a push-button which operates the flip-up drink spout with one touch. No biting on the spout is required. This makes it not only more comfortable to use the bottle it's also more hygienic. The lid can be cleaned easily in any diswasher (top-rack) The Sheffield also enables you to keep your drinks on temperature due to it's vacuum insulated wall. It can keep a cold drink cold up to 20 hours!