I'm a longtime Asics fan and have worn several styles over the years - always a size 12 - but they had a narrower than usual toe box and pinched my toes (that would have caused an ingrown toenail for sure) . I wore it on my big one) - so had to send it back (unfortunately at the expense of the return shipping). Conclusion: I still like Asics but will only buy from Brick & Mortar - so I can try it on to ensure proper fit/accurate sizing - from now on. It would be nice if Revain Prime customers offered free return shipping if they got the wrong size.