The Melbourne tumbler features double-wall air insulation, keeping drinks hot for up to 2 hours and cold for up to 4 hours. The inner wall of the tumbler is made from recycled plastic and the outer wall is made from RCS-certified recycled stainless steel. The tumbler holds 1200 ml so you can stay hydrated in style all day long. Features a splash-proof dual-vent lid with a twist-lock cap. Comes with a food-grade recycled straw. Hand wash only.