Stainless Steel Outer And Inner. Double Wall Construction For Insulation Of Hot Or Cold Liquids. Snap-On, Spill-Resistant Thumb-Slide Lid With Rubber Gasket Due To Vacuum Insulation Technology, Capacity Is 18 Oz. With Lid On. Keeps Drinks Hot Or Cold Up To 6 Hours. Non-Skid Rubber Bottom. Meets FDA Requirements. BPA Free. Hand Wash Recommended. This item is made to order so please allow 10-15 business days for production plus transit for delivery.