As Seen On Shark Tank With NFL Hall of Famer, Rob Gronkowski “Gronk”. Stainless Steel Outer And Inner. Double Wall Construction For Insulation Of Hot Or Cold Liquids. Screw On, Spill-Resistant Flip-Top Lid. Vacuum Insulated. Internal Measurement Markings. Easy Carry Handle. Removable Agitator Breaks Up Powders And Strains Out Ice. Flavor Your Beverage With Your Choice Of Fresh Fruit. Meets FDA Requirements. BPA Free. Hand Wash Recommended.