ASICS GEL-Kayano 21 vs. Saucony Hurricane ISO review

ASICS GEL-Kayano 21 offers a very plush and comfortable ride to moderate overpronators. Saucony Hurricane ISO is a very stable and supportive running shoe with a cushy forefoot.

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The ASICS GEL-Kayano 21 and the Saucony Hurricane ISO are stability running shoes that can be worn by runners who moderately overpronate.


While the upper of the Saucony Hurricane ISO does have stitches in it, its ISOFIT upper consists mostly of a broad overlay on the two sides of the shoe that wrap your midfoot well and allow your foot to move with the shoe.

While the ASICS GEL-Kayano 21 does not have such broad overlays around the midfoot, it does provide sturdy stitched-on overlays on both sides of the shoe.

So both running shoes should give you a good lockdown around the midfoot.

In the forefoot, the Saucony Hurricane ISO is similar to the ASICS GEL-Kayano 21 in that it has light no-sew overlays running over the toe box to provide structure there.

The ASICS GEL-Kayano 21 has FluidFit no-sew overlays running in the frontal part of the shoe and because these overlays are somewhat stretchy, the ASICS GEL-Kayano 21 should provide a better closer-to-foot feel in that area than the Saucony Hurricane ISO.

The Saucony Hurricane ISO and the ASICS GEL-Kayano 21 are also very similar at the back of the shoes where both provide a sturdy heel counter to really lock the heel down on the running platform.

If you are looking for a running shoe with a very supportive upper, either the ASICS GEL-Kayano 21 or the Saucony Hurricane ISO would do.

It is a matter of what kind of fit you are after. If you are looking for an overall glove-like fit, then the ASICS GEL-Kayano 21 might be able to provide that better than the Saucony Hurricane ISO.

The ASICS GEL-Kayano 21 and the Saucony Hurricane ISO provide heel-to-toe cushioning in their midsoles, and both have relatively thick midsoles so offer lots of protection from the road.

However, the thickness of the midsole in the heel differs about 5.5 mm in the women's versions of the shoes. And while the difference is much less for men, the Saucony Hurricane ISO turns out to be firm in the heel when compared to the ASICS GEL-Kayano 21.

This is also probably because of the two layers of foam in the midsole of the ASICS GEL-Kayano 21 combined with the GEL cushioning it provides in the heel as well as the forefoot that makes the ASICS GEL-Kayano 21 feel so soft under your foot.

In any case, if you are a heel-striker, the ASICS GEL-Kayano 21 would suit you better than the Saucony Hurricane ISO. The amount of forefoot cushioning is about the same in both shoes; both have very cushy forefeet.

Pronation control comes in the form of a firmer piece of foam on the medial sides of the shoes.

This piece of foam extends all the way to the ground in the Saucony Hurricane ISO, while a midfoot shank reinforces it in the ASICS GEL-Kayano 21, thereby preventing full ground contact to take place.

So you can expect to get better arch support from the Saucony Hurricane ISO as well as a smoother transition from heel-strike to toe-off, since its crash pad on the lateral side of the midsole runs from the back of the heel till the midfoot and seamlessly joins the forefoot there.

In other words, the Saucony Hurricane ISO provides a much more stable platform for you to stand and run on.

The rubber outsoles of the ASICS GEL-Kayano 21 and the Saucony Hurricane ISO are well-segmented for good shock dissipation. They also have a good amount of deep flex grooves in the forefoot.

Both the ASICS GEL-Kayano 21 and the Saucony Hurricane ISO have thick midsoles in the forefoot, so are expected to be somewhat stiffer running shoes.

But running shoe lab tests have shown that the Saucony Hurricane ISO is more flexibile than the ASICS GEL-Kayano 21 for women, and that the ASICS GEL-Kayano 21 is more flexible than the Saucony Hurricane ISO for men.

The women's version of the Saucony Hurricane ISO weighs approximately 8.7 oz (247 grams) and the ASICS GEL-Kayano 21 for women weighs 9.5 oz (269 grams). The men's versions of shoes weigh 10.6 oz (301 grams) and 11.3 oz (320 grams), respectively, with the ASICS GEL-Kayano 21 being the heavier one..

If you are looking for an overall cushy running shoe that provides a good amount of stability and support, then the ASICS GEL-Kayano 21 might fit the bill.

And if you want a relatively lightweight running shoe that provides tons of stability and support and you are not a heel-striker, then the Saucony Hurricane ISO could provide what you are looking for.

Note: The weight of a running shoe depends on the size of the running shoe, so any weights mentioned in this review may differ from the weight of the running shoe you choose to wear. Running shoes of the same size were compared for this review.

The two links above will take you to where you can read more about the running shoes.

This review falls under: ASICS | Saucony

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