The Contigo Huron 2.0 SnapSeal Insulated Stainless Steel Travel Mug keeps drinks at their ideal temperature for hours thanks to Thermalock double-wall vacuum insulation. The 16 oz. keeps drinks hot for up to 6 hours and cold for up to 12. The 20 oz. keeps drinks hot for up to 7 hours and cold for up to 18. 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.