I bought 2 of these and both of have liquid in them! For $70 I expect something a little more durable. Kugelkopf entfernt, Montagelöcher gebohrt und mit der Aufnahme einer kurzen und stabilen Halterung aus Alu kombiniert. I bought this table from Amazon Warehouse and I suspect it was a return. Oh my gosh this adapter bar is the best! Still, a nice surprise when they did arrive. After it loosened these shoes were perfect and comfortable while standing for a long period of time. But the case itself is really sturdy, and the bubble marks arent really noticeable anyway. I love the design - best I have tried yet. The tops of the slippers are OK, they stretch and fit my feet snuggly.