Enjoy one-handed drinking with a lid that snaps shut for leak-proof convenience. Plus, drinks stay hot up to 7 hours or cold up to 18 thanks to double-wall vacuum insulation. The SnapSeal Insulated Stainless Steel Travel Mug, 20 oz., keeps drinks hot up to 7 hours or cold up to 18 thanks to THERMALOCK double-wall vacuum insulation. 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.