When mugs filled with hot coffee, no worry about burning your hand or fingers; the cork bottom not only insult the heat but also prevents scratching and staining, anti-scald and without clink noise, especially protect wood desk or glass table well, it is a great choice for the office or home use. The tea mug comes with a push-on, splash and dust proof lid, you can enjoy your drink through the sliding cover at the top. (It is not a thermos mug, but the lid can keep the liquid warm for a while). This lid can prevent the splash but not the spill (the liquid will leak if you turn over the coffee cup). Just ensure that do not turn a filled coffee mug upside down to avoid likely leakages, you can enjoy coffee at home or travel with it. 15 oz. coffee mug set: 2-pieccs reusable 15 oz. large coffee mug set perfect for coffee, tea, water, and so on in diversification use; it's a great gift for Thanksgiving Day, Christmas, father’s day, parents, couples, friends, lovers, anniversary, wedding.