I much prefer these for being flat-flat but no uncomfortable I walk around all day in the them and stand for long periods of time cleaning without any issues. I didn?t not like it so much. 2 mm bars. After the 2nd wear, the footbed is peeling as others have noted. The lids of the containers snap shut and hold closed well. Did not send them back just going to keep and wait for my daughters feet to grow It?s still a good chunk of money but it?s a great addition. Lastly, at the end of every winter, my cheap slippers are dirty, worn out and stinky so they end up in a landfill sitting there forever. It is an attractive case and the color matches the original. Kids really liked this game at the beginning but it was relatively brief.