Who’d have imagined it a few years ago? The 2014 Kayano 21 is here, and it now happens to be one of the softest running shoes in Asics’ line-up when it comes to cushioning. And just how soft? More than the Kayano 20, and surprisingly, more than the Asics Gel Nimbus 16 too. This aspect is the key difference between last year’s avatar and the just released 21. There are some other subtle design updates, consistent with Asics’ approach of incremental evolution.