I wear a street shoe size 7, downsized 1 full size-Euro 37. Fresh out of the box I thought I was going to have to return-it took me 10 minutes to put each shoe on.I could wear them for about 25 sec before ripping them off. After 4 weeks of break in, I started to wear these for regular climbing sessions. They have molded perfectly to my feet! I have used them mostly for bouldering with the intent to use them ultimately for sport. I had the opportunity to try them at Squamish and couldn't have been happier with their performance! Negatives: the break in period was a tease! but worth it. Also, the rubber on the inside of the shoe can cause some major blisters on the tops of your toes.