Comments: I have very flat feet with moderate late over pronation. I found the toe box to be very roomy, which I liked. The cushioning and support were great. The only thing I didn't like about them was the arch had a high bump just behind the first metatarsal head giving it a very unnatural feel. I compared them to the inspire 9. The inspire had a better arch for flat feet, but the toe box was significantly narrower. If the nirvanas had the arch of the inspire they would have been a keeper. Sending the nirvana back. May keep the inspire. I usually wear a 9.5 in Asics, but had to order a 10 in Mizuno.
From: Cm, VT