I purchased this item and hand wash only. It is useless to me for 2 reasons. First, even 'conditioning' the mug by filling it with hot water before filling your mug with hot coffee does not keep the coffee hot. Secondly and my biggest issue is that there is some tiny space either either near the mouthpiece or around the lid where the mouthpiece is that causes it to leak whenever I try to take a sip of coffee. If I tilt the cup at all, both me and my 'top' get to wear the coffee. Very unhappy with the poor quality.