I am very impressed with these shoes. They are very light and comfortable. I'm an 11 wide and I usually wear 12's, but I bought 11's because I didn't want them to be loose at all. I've had them for a few days and they fit great. They do smell funny and I had to scuff the soles a little, because they were really slippery on my hardwood floors. I love them. I don't actively practice any martial arts; I do mostly bodyweight calisthenics (Matt Furey's Combat Conditioning) and some of the stretching and conditioning I remember from my old Isshinryu Karate class I took in college. I can't find a better shoe for what I do.