Our problem was one slipper seems tighter than the other.  Don't remember my daughter having that problem before?  I waited too long so I'm not sure if I can return these.  These say they are made in China, but so are alot of other things.  I think the Acorn slippers are more on the comfy side, and we've had better luck with 3 pairs so far.  The Acorn slippers don't have a tag on them so not sure where they are manufactured.  I think I will try and do a return and see what happens.  Otherwise, the materials appear to be of high quality so maybe we just got something out of the ordinary.