The Contigo 20 oz. Huron SnapSeal Insulated Travel Tumbler has a sturdy and vacuum-insulated double-wall keeping drinks hot up to 6 hours and cold up to 12 hours. The stainless steel Huron mug is leak-proof thanks to patented Snapseal technology and comes with a special reservoir so you can sip your hot drink. The one-piece SNAPSEAL lid allows for one-handed drinking with no lids or caps to remove or misplace and is leak-proof when closed.