Stainless Steel Outer And InnerDouble Wall Construction For Insulation Of Hot Or Cold LiquidsSnap-On, Spill-Resistant Thumb-Slide Lid With Rubber GasketDue To Vacuum Insulation Technology, Capacity Is 18 Oz. With Lid OnKeeps Drinks Hot Or Cold Up To 6 HoursNon-Slip BottomMeets FDA RequirementsBPA FreeHand Wash Recommended