From Iriss husband.  I have run in the ASICS GT model for over 25 years, ordering by mail order (Road Runner Sport).
They have hints on how to arrive at the correct size, which is increase by two over your street shoe size.  My street size shoe is usually 9 1/2.  Therefore I always order 10 1/2 for the GT and that has worked out great for many years.  Not so, this time.  These shoes are tight!  I have to wear real thin socks or no socks at all.

I would return them for a swap, but the military PX mail order system was cumbersome and the process was slow on an earlier order.  I I didn't want to go through that again so I have already worn them already on a couple runs.
Email:  Burl.pepper@yahoo.com