Saucony Kinvara 6 vs. Saucony Zealot ISO review

Saucony Kinvara 6 is good for performance runs by runners who want a light running shoe on their feet. Saucony Zealot ISO provides a smooth ride with a very cushy forefoot.

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The Saucony Kinvara 6 and the Saucony Zealot ISO are both neutral cushioning running shoes from Saucony for runners who want to feel closer to the ground and who are looking to wear something light on their feet.


The uppers of the Saucony Kinvara 6 and the Saucony Zealot ISO differ quite a bit due to the ISOFIT overlays that the Saucony Zealot ISO has.

These overlays wrap the midfoot well around socklike mesh, so should give you a good lockdown in that area. The Saucony Kinvara 6 is built to be lighter, so does not have such overlays.

Instead, the Saucony Kinvara 6 comes with a band on the medial and lateral sides of the shoe that can be adjusted through the saddle to wrap the midfoot and give you a secure fit.

These bands are also placed more towards the back of the Saucony Kinvara 6 than the ISOFIT overlays of the Saucony Zealot ISO, so that your foot has more comfort in a large frontal part of the Saucony Kinvara 6.

Both running shoes have lighter no-sew overlays running over the toe box to provide structure to the upper.

One last difference is that the Saucony Zealot ISO has a Support Frame at the back of the shoe that cups the heel to give you a good amount of support and lockdown there.

All in all, the upper of the Saucony Kinvara 6 was built to be light yet give you enough support to keep your foot on the platform. The upper of the Saucony Zealot ISO on the other hand was built to give you a better lockdown on the platform.

Both the Saucony Kinvara 6 and the Saucony Zealot ISO have midsoles that provide heel-to-toe cushioning. However, the type of cushioning provided by the Saucony Kinvara 6 is more responsive than that provided by the Saucony Zealot ISO.

Saucony says that the cushioning of the Saucony Kinvara 6 feels firm and responsive and that of the Saucony Zealot ISO feels plush.

According to running shoe lab tests, the two running shoes come close to the amount of cushioning provided. The amount of forefoot cushioning is about the same in both running shoes and for both men and women.

However, the Saucony Kinvara 6 offers more heel cushioning than the Saucony Zealot ISO for both men and women.

The midsoles of both the Saucony Kinvara 6 and the Saucony Zealot ISO have a beveled crash pad under the heel and they touch the ground at the midfoot, so do not have midfoot shanks.

The full ground contact of both shoes should benefit the stability of the shoes, but also offer you a smoother transition from heel-strike to toe-off.

The biggest difference between the Saucony Zealot ISO and the Saucony Kinvara 6 can be found in the outsole where the Saucony Zealot ISO has more rubber than the Saucony Kinvara 6.

The Kinvara 6 just has a couple of rubber pods under the heel, along the outer edge of the outsole, under the forefoot, and under the toes. The rest is exposed midsole foam.

This makes the Saucony Zealot ISO more durable than the Saucony Kinvara 6, since the Saucony Zealot ISO has much more rubber in its outsole.

The configuration of the rubber compartments is also different, especially in the forefoot. The Saucony Zealot ISO has fan-shaped flex grooves, while the flex grooves of the Saucony Kinvara 6 run better from side to side.

The latter benefits the flexibility of the shoe. And indeed, the Saucony Kinvara 6 is much more flexible than the Saucony Zealot ISO according to running shoe lab tests.

This difference is very big, especially for women. The Saucony Zealot ISO turns out to be quite stiff for both men and women.

The women's version of the Saucony Zealot ISO weighs about 7.2 oz (204 grams) and the Saucony Kinvara 6 for women weighs approximately 6.5 oz (184 grams).

The men's versions of the running shoes weigh approximately 8.5 oz (241 grams) and 7.8 oz (221 grams) with the Saucony Kinvara 6 being the lightest of the two.

If you are a neutral runner, you could choose either the Saucony Kinvara 6 or the Saucony Zealot ISO.

However, if you are looking for a very lightweight and responsive neutral running shoe that offers a good amount of cushioning, the Saucony Kinvara 6 would fit the bill.

And if you are looking for something more durable in terms of the mileage you would get out of it, then the Saucony Zealot ISO is worth looking into.

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: Saucony

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