The ASICS Gel-Kayano is an excellent stability training shoe that serves an important niche for runners with both wide and flat feet. The Gel-Kayano has a wide toe box and comes in wide (2E) and extra-wide (widths), so those with wide feet can be sure that there's a Gel-Kayano size for them. This is important because the Gel-Kayano is also a stability shoe, meaning it's good choice for runners with wide and flat feet.
This means that the Gel-Kayano provides additional medial support for runners with flat feet and those whose feet tend to roll when they run.
Runners with wide and flat feet who need support for long days on their feet will be relieved to know that the Gel-Kayano is there to serve as a safe option.