Ground breaking technology combines the strength of stainless steel with the softness of ceramic creating an unparalleled drinking experience! NO trapped smells or flavors. Does not stain. Easier to clean. Dishwasher durable. BPA Free, Phthalate Free & Prop 65 Compliant. Vacuum insulation keeps beverages hot or cold with incredible temperature retention. BPA Free push in acrylic top with EZ clean sliding closure. Once you drink from CeramiSteel® you may never want to go back to plain stainless!