The Hydravault FlipStraw Tumbler with Handle 40oz is crafted from high-quality materials for optimal durability and performance. The cup features an inner layer of 304 stainless steel and an outer layer of 201 stainless steel, providing excellent insulation. The handle is made from durable PP (polypropylene), and the straw is constructed from PE (polyethylene). The lid combines AS (acrylonitrile styrene), PP, and silica gel for a secure and comfortable drinking experience.