Price: $120
Type: Road
Weight: 10.2 oz (M), 8.1 oz (W)
The Right Shoe For: Kicking off (or sticking with) your marathon training
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Asics broke all the rules in its roaring 20th update to the Cumulus—and we couldn’t be happier about the improvements. Shave nearly an ounce and a half of weight off the shoe? Check. Swap out the old foam with a lighter FlyteFoam midsole? Done. Put the cherry on top with a more breathable upper? You better believe it. After two decades as a go-to trainer for neutral-footed runners, the Cumulus proves it can still surprise—while maintaining the quality that Asics enthusiasts expect.
Longtime runners in the Asics brand picked up fast on the changes to the Cumulus. Besides noting that the shoe definitely felt lighter, our testers sensed less cushioning and more stiffness than previous models—which our data from the RW Shoe Lab supported. While the declines were subtler in the men’s version, the ladies’ saw more sizeable drop offs that one tester said gave the shoe a “crisper and more responsive ride.” However, not all were sold on the shoe’s foreign stiffness, and preferred the cushioning and flexibility they were accustomed to. Runners seeking a plusher Asics shoe might opt for the Nimbus 20.
Shock-absorbing Gel Cushion
Previous models in the Cumulus series used a plastic support truss under the arch that bolstered the shoe’s midsole. The 20 shed this feature when it transitioned to the firmer, higher-density FlyteFoam. Now the Cumulus relies primarily on a vertical sole groove that guides the foot through the gait cycle, and still offers more than enough support for our neutral-footed testers. “The guidance system really controls your landing mechanics,” one tester remarked. “I felt like I couldn’t really go with my natural gait.” This type of guidance, however, would fit the bill for those who underpronate.
The new Cumulus still sports a layer of Gel cushioning in its midsole, absorbing shock better than foam alone. Asics concentrates the gel in both the heel and forefoot for smoother transitions, and better protection through the entire gait cycle.
A Tread for High Mileage
Traction on the Cumulus 20 was a favorite feature for a number of our wear-testers. Asics plants pockets of high-abrasion rubber in specific areas of the outsole for more grip right where you need it, which helped the shoe perform well over rain-slicked roads and even trails. Plus, our testers commented that the tread seemed especially durable, with expectations to last through high-mileage training.
Slimmed Down and Restyled Upper
For the big 2-0, Asics overhauled the upper with a stretchier jacquard mesh that breathes better than previous versions. The material also replaces several of the heavier plastic overlays that adorned the 19, in favor of a fit that adapts better to the foot. Stepping into the shoe, our testers immediately noted the cozier new sockliner, which wraps the foot snugly and helps guard against blisters. “[The Cumulus 20] offers high-performance comfort,” one tester vouched. “But the upper does have a tighter fit within a narrow toe box, which may be best suited for runners with slender feet.”
Running Gear for Beginners
All the Stats You Need!
Men’s
- Weight: Moderate | 10.2 oz
- Heel-To-Toe-Drop: Moderate | 9.2 mm
- Heel Height: Very High | 35.3 mm
- Heel Cushioning: Soft
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- Flexibility: Very Stiff
- Stability Features: Some
- Energy Return: Moderate
Women’s
- Balega Running Socks
- Heel-To-Toe-Drop: Very High | 10.9 mm
- The Cumulus series ties a bow on two decades in this majorly updated everyday trainer
- Forefoot Cushioning: Soft
- Heel Cushioning: Soft
- Forefoot Cushioning: Firm
- Flexibility: Stiff
- Stability Features: Some
- Energy Return: More
We put each shoe through real-world usage and a battery of mechanical tests in our lab to provide you with objective—and exclusive—data. In addition to measuring a shoe’s weight, we measure sole thickness (everything that sits between your foot and the road), how well the foam cushions your stride, and the flexibility of the forefoot. All this is taken into account in our reviews of each shoe.
Forefoot Cushioning: Soft Runner’s World Flexibility: Very Stiff The Warmup, Forefoot Height: Moderate | 21.5 mm RW newsletter. Now, she tests and reviews anything you might find on runners’ feet-from crew socks and compression boots to carbon-plated super shoes.
A lifelong runner and shoe geek, Morgan has been chasing the perfect pair of kicks since she joined her grade school cross-country team. Since then, she ran as a Division I walk-on for the cross-country and track & field teams at the University of Delaware, where she studied English and Biology. She has one full marathon under her belt, and has raced more halfs and 5Ks than she can count.
