Description Acrylic Outer And Inner. Double Wall Construction For Insulation Of Hot And Cold Liquids. Screw On, Spill-Resistant Lid With 9" Straw. Decoration Is Inserted Between The Clear Double Walls Of The Tumbler Then Ultrasonically Sealed To Provide Double Wall Insulation. Stain Resistant. Meets FDA Requirements. BPA Free. Hand Wash Recommended.