Yeah, I got one in each size from TW. Depends on your foot type/shape and how snug or loose you want it. I'm 9.5 in Vapor 9s, CB4.3s, 2K11/12s. I needed to go down to a 9 in LLV8s, 2K10s. I remember the Breathe Free 2s vaguely. I think this fit pretty similar to those (but back then, I didn't have the Elite socks to deal with).