The Kayano 16 is a lot more stable then its previous version, the 15. We tested the shoe with several athletes who pronate (some more than others), so we could compare how the 16 is different from the 15. With all testers we noted a pronation angle much less with the Kayano 16. The reason why the stability has changed is the new way Asics goes about prducing its midsoles.

For the athletes who were satisfied with the 15 I don’t think that you have to worry about injury issues when changing to the 16 unless you are on the other end of the scale and the 15 was almost too supportive for your running style. If you are not sure just go to your specialty running store and have your shoes checked.

Are there any other differences? Yes, the fit also has changed. The Kayano 16 is slightly more narrow then the 15, especially in the midfoot to forefoot. Also the asymmetric lacing is a little less asymmetric. In terms of cushioning they feel about the same. The big beefy Gel unit underneath the heel is the largest in the history of the Kayano and is also still there under the forefoot. And all of this doesn’t make the shoe any heavier; on the contrary it is even slightly lighter.

What I think the most pleasant change is that all of the testers said that the Kayano 16 felt a little more supple in heel-to-toe transition, so, it offers a smoother run.

Overall, still one of the best shoes in this category.

This Review of the shoe was supplied by Dan Empfield of Slowtwitch.