I bought 6 pairs, one had a small hole on the side of the heel, but it hasn't grown from wearing and washing, so all and all great socks half the price of other toe socks on amazon.  People protect your Fivefingers shoes from your stinky feet, seriously, I'm starting to think the worse thing about the shoes is the people who think they can wear these without socks.  Just because they look like and probabilly came from swim shoes doesn't mean you can wear them without socks.