Finished with Zojirushi's odour and stain-resistant non-stick coating Vacuum insulation keeps beverages hot or cold for hours Safety lock prevents drinks leaking out Sip straight from the mug with its BPA-free flip-top lid and stopper Zojirushi's stainless steel vacuum insulation mug will keep your beverages hot or cold for hours. The compact design takes minimal space while maximizing capacity. Each flip lid is tightly fitted for excellent heat retention and features a safety lock to prevent accidental opening. Durable and sanitary these mugs have a stainless steel interior with non stick coating for easy clean up.