My toes fell asleep in a few minutes of wearing. I had ultra thin socks on, but the toes were very uncomfortable. One heel cup was awkward enough to rub my heel a bit tender just strolling around the house, not sure if it was damaged by previous person trying-on?. The flexible slightly padded shoe sole was OMG VERY COMFORTABLE!! I so SO wanted these to work! I have women's USA 8 EE feet, bought the 40/9 to accommodate my high arches and wide forefoot. It was long enough, stretchy for my wide forefoot, yet narrow enough to keep my narrow heels in.  I would have kept these, however my toes were falling asleep from the tight toe pockets.  I would give it 5 stars if the toe pockets were more flexible or wider.