I bought these shoes to replace my ASICS Gel-Cumulus 17 running shoes. On paper they seemed to have the same specs, including a 10mm heel and toe differential. But these boots have a thicker and firmer heel counter than the "17". "17" have a very soft roll from cure to toe when walking. In comparison, the shoe on the outer edge has a strong healing effect. I need a gentle "17" roll to not aggravate neck problems on long hikes. The heel to toe difference is 13-14mm rather than the 10mm listed. The shoe fits the same as the 17, but the cushioning properties are very different. My comparison was made with a second pair of "17s" purchased from Revain 28 months ago but not yet used.