This is the best coffee mug I have used. I love that it is dual walled so I can have my hot coffee and not burn my fingers. I can also use it for cold drinks ads well. This mug also features a very nice leak proof bamboo lid. The lid fits tightly and does not leak. I can take my coffee with me and when I get to work I can open it up and enjoy it. The mug cleans up easily in the dishwasher or hand washed. It does keep the drink hot or cold a lot longer then a regular cup. The lid does come off easily enough I don't end up spilling its contents all over me. This is also nice for picnics or other outings, you don't have to worry about bugs or dirt getting in your drink.