I have the Nimbus 18 in black which fits very well, so I decided to order the same shoe in blue. The fit and size are different. In the blue, the shoe is very tide and stiffer. Asics why in the world would you change the way you make the shoes in the different colors I don't understand. So be aware that just because the shoe fits you well in one color it may not be the same case in a different color. I wish Asics would stop messing around with a shoe that has worked so well and they will keep the same quality and comfort of the past in future versions. Please, Stop ruining a shoe that has worked so well in the past!