The hole is bigger than it should be, resulting in the tails not staying on the pan. I thought I had bought a defective package, but the next one was exactly the same.

The hole for the tail is excessively large, resulting in all the dirt escaping from there. The underwear itself, if it managed to retain liquids, I am sure it would be very absorbent. The same applies to the smaller size I tried. The manufacturer probably needs a better design. Any baby underwear has a much better fit by cutting the hole for the tail with scissors, to a smaller size, so they fit better.