This is my third pair of climbing shoes within the last two month. I had no luck with other brands and sizing. I wear a streetsize 12 and even evolve and 510 size 13 killed my toes. After reading the reviews I decided to go with the Mythos size 12. I wore them to the office three days taped up my heels and used some vaseline around the edges to break them in. They mold around your feet and with the lacing you can adjust the fit nicely. Last weekend I climbed two full days and they are very comfortable. They are not the most agressive shoes for crazy climbing but you can wear them all day long and they are really comfortable climbing shoes.