This shoe is totally different from the Kayano 20. Do not order without trying it on first. The toe box is wider, giving the front of the shoe a sloppy fit. The trim seams across the outside top of the toe area is moved and causes chafing and there is a change in the heel that requires bandaids on my heels to prevent blisters as well. There must be a change in the drop of the shoe as well, I have always been a heel striker, and these shoes turn my legs to lead after 5 miles.  For the first time in 10 years I am disappointed with my Kayano purchase.