I honestly don’t know. I’m a 10.5 in most Nike shoes and when I had the ZC2, I had to go with 11. One time I bought the women ones on clearance because of the unisex colorway but in a size 12 (which was the biggest) Somehow that pair felt very wide. The label didn’t say anything about being wide/2E. I arch felt fine and I know most women shoes are narrow but those that day were wide on my feet.