Recycled Stainless Steel Outer And Inner. Recycled PP Lid With Flip-Up Tab Design. Lift Pull-Tab To Open Lid. Powder Coated Finish. Double Wall Construction For Insulation Of Hot Or Cold Liquids. Vacuum Insulated. Screw On, Spill-Resistant Sip Through Lid. Removeable Carabiner Attachment On Lid. Non-Slip Base. Carabiner Not For Climbing. Meets FDA Requirements. BPA Free. Hand Wash Recommended.