GUARDIAN 30oz TUMBLER KIT was designed for the everyday user. Our stainless steel two layer construction has an air vacuumed barrier that minimizes the transfer of heat, keeping drinks at their ideal temperature and the vessel sweat-free. It comes with a splash-proof and straw compatible flip-top lid. Cold for up to 24 hours and hot up to 6 hours. The powder-coated 18/8 Kitchen grade stainless steel construction is free of BPA & Phthalate, cup holder friendly and dishwasher safe.