Vacuum insulated stainless steel keeps drinks hot for up to 5 hours cold for 20 hours. Cork bottom provides built-in coaster. Patented leak-proof sealing slider lid. Hand wash vessel lid is dishwasher safe. Certified BPA-free phthalates-free PVC-free lead-free and cadmium-free. Proposition 65 Compliant. Meets FDA Requirements. BPA Free.