These shoes have NO arch support. I have had a couple of pairs of Pearl Izumi mt bike shoes that I love, but that love didn't translate to these running shoes. I usually wear an 8.5 in regular running shoes, a 9.0 in minimalist type running shoes. I ordered a 9.5 in these and they were still a half size too small. I could tell they would not be comfortable even in the right size, so they are going back.