I really wanted to like these. I order the gray/blue/pink in my usual size, 6.5US. When they arrived and I put them on, I immediately noticed that my big toes were rubbing and that the toebox was very narrow. I checked the box and found that the US size listed did not match the EU or British sizing. In 6.5 US equates to 37.5 EU... the EU size listed on the box was 37. So I ordered the next size up, 7 US. These fit correctly in the length of my foot (not big toe/toenail cramming), but they are still very narrow for my average width foot. Just sitting around the house with them in I can feel my feet being squeezed and beginning to go numb. There was also a small degree of slippage and rubbing in the heel with thicker socks on, which, oddly, went away with a thinner pair of socks. I'm likely to be returning.