Even though I paid shipping (~36 CAD) and duty (~41 CAD) on this delivery (the two decks of cards / dice were in this order as well), I am satisfied with it. The lid is made of a soft black silicone and seals in liquids quite well from what I can tell. I didn't really put it to the test by turning it upside down, but I don't think any cup with a lid passes that test. There is also silicone on the bottom to prevent it from sliding unnecessarily. It functions as a tumbler should and keeps everything inside hot, while keeping your hands unscathed. I haven't noticed any imperfections on the body of the cup itself and so, all looks in good order. I'm addicted to the theme of this brand but the shipping and duty has me second guessing buying too much more.