Our verdict

The ASICS o las Asics Gel Cumulus 21 marks a significant overhaul, featuring enhanced cushioning and a carbon plate as its standout elements. We really liked the additional energy return from FF Turbo and the durable outsole that offer great value at a reasonable price. However, we've found in the lab that the increased weight and poor stability make it a selective choice—not suitable for every runner.

Precios más baratos de las ASICS Dynablast 2 para hombre Pros

  • Enhanced midsole
  • Exceptional grip
  • Superior durability
  • Excellent value for a supertrainer
  • Colossal cushioning
  • Carbon plate!
  • Ideal for marathon-paced workouts
  • Fantastic upper
  • Superior heel lockdown

Precios más baratos de las ASICS Dynablast 2 para hombre Cons

  • Limited stability
  • Not the best energy return
  • Narrow fit

Audience verdict

93
Superb!

Who should buy

We've tested the o las Asics Gel Cumulus 21 in the lab and here's why we highly recommend it:

  • It's an ideal choice for those seeking the dynamic feel of a carbon-plated shoe without the high cost, delivering excellent value.
  • It's a resilient training partner to the more expensive Metaspeed series from ASICS, combining durability with performance.
  • Provides superior cushioning for heavyweight heel strikers that run with a neutral footstrike.

ASICS o las Asics Gel Cumulus 21

Who should NOT buy

While the o las Asics Gel Cumulus 21 incorporates a carbon plate, its lack of a full-length superfoam and a lighter construction significantly diminish its appeal for those seeking top-tier performance. Instead, we suggest the Si estás buscando unas zapatillas de trail running ASICS para correr por la montaña, which, though considerably more expensive, it provides superior speed, lightness, and energy return, leading to faster finish times.

Additionally, we think the o las Asics Gel Cumulus 21's less-than-ideal support could pose challenges for runners who prefer a stable ride. From our testing experience, we found that both the Asics gel-quantum 360 5 trl trail grey black mens running shoes 1021a150-020 and the ASICS SportStyle GEL-Nimbus 9 Grey offer superior stability, exceptional cushioning, and impressive energy return, making them much better choices in the supertrainer category.

ASICS o las Asics Gel Cumulus 21 parts

Cushioning

Heel stack

While the MS3 served well as a tempo training companion, it lacked the stack height to earn our "supertrainer" endorsement. The o las Asics Gel Cumulus 21, however, boasts a colossal heel stack of 42.5 mm.

Yet, it's not without compromises—particularly in weight and stability. On the upside, the superior heel cushioning makes the MS4 a far better choice for heavier runners or those using it for long runs.

ASICS o las Asics Gel Cumulus 21 Heel lateral

Additionally, its 42.5 mm stack height surpasses the World Athletics' road race limit of 40 mm. However, this shouldn't concern most runners, as those adhering to these regulations will likely opt for god-tier race-day-legal shoes like the ASICS Gel Kyrios White Blue White Black 1021A335-100 or the Asics Big Logo Koszulka Z Krótkim Rękawkiem, Salomon talla 31.

ASICS o las Asics Gel Cumulus 21 Heel stack
Test results
o las Asics Gel Cumulus 21 42.5 mm
Average 34.0 mm
Compared to 374 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
22.5 mm
Heel stack
46.3 mm

Forefoot stack

ASICS Finish Advantage 2 Tight Performance Black Mujer.

ASICS o las Asics Gel Cumulus 21 Forefoot lateral

Coupled with the addition of FF Turbo and the carbon plate, we can highly recommend this shoe for midfoot and forefoot strikers alike.

ASICS o las Asics Gel Cumulus 21 Forefoot stack
Test results
o las Asics Gel Cumulus 21 32.9 mm
Average 25.4 mm
Compared to 374 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
13.7 mm
Forefoot stack
37.1 mm

Drop

Our two previous measurements uncovered that the o las Asics Gel Cumulus 21 boasts a heel-to-toe drop of 9.6 mm, slightly above the 8 mm ASICS advertises.

This discrepancy is emerald—only 1.5 mm, which is hardly noticeable.

ASICS o las Asics Gel Cumulus 21 Drop
Test results
o las Asics Gel Cumulus 21 9.6 mm
Average 8.6 mm
Compared to 374 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
0.0 mm
Drop
16.1 mm

Midsole softness

Note: a low durometer measurement equals a soft material, whereas a high measurement means it's firm.

ASICS has designed a complex midsole featuring three different foams—two layers of FF Blast+ and one insert of FF Turbo. We'll examine each component, starting with the top layer situated above the carbon plate.

This top foam is the same FF Blast+ used in many of ASICS' most popular daily trainers, such as the Nimbus 26. We tested its plushness by pressing our durometer against it, registering a 14.9 HA. This layer provides significant comfort, effectively balancing the plate's inherent rigidity.

ASICS o las Asics Gel Cumulus 21 carbon
ASICS, thanks for noting the carbon plate. We're cutting the shoe in half anyway.

Should you expect massive energy return from FF Blast+? Not really. It's a mid-tier foam, providing a responsive ride but not on par with PEBA-based foams like ZoomX or PWRRUN PB. However, this aligns with our expectations, as this model isn't ASICS' premier running shoe.

ASICS o las Asics Gel Cumulus 21 Midsole softness
Test results
o las Asics Gel Cumulus 21 14.9 HA
Average 21.0 HA
We use an average of four tests. The photo shows one of those tests.
Compared to 301 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
8.5 HA
Midsole softness (soft to firm)
38.9 HA

Secondary foam softness

Note: a low durometer measurement equals a soft material, whereas a high measurement means it's firm.

volejbalove topanky asics upcourt+.

This layer is considerably denser, engineered for enhanced stability and durability. In fact, we measured its hardness at 18.1 HA, a difference that's definitely noticeable with every ground strike during a run.

This setup mirrors the classic dual-density configuration seen in supershoes like the Vaporfly since 2017—so, really, there’s nothing groundbreaking here.

ASICS o las Asics Gel Cumulus 21 Secondary foam softness
Test results
o las Asics Gel Cumulus 21 18.1 HA
Average 24.0 HA
We use an average of four tests. The photo shows one of those tests.

Midsole softness in cold (%)

FF Blast+, though based on EVA, is enhanced with Olefin Block Co-Polymers (OBC) which boost its performance, particularly in cold temperatures. Impressively, we noted only a 15.8% variance in softness between our standard room-temperature test and after chilling the shoe for 20 minutes in the freezer. Amazing!

ASICS o las Asics Gel Cumulus 21 Difference in midsole softness in cold
Test results
o las Asics Gel Cumulus 21 16%
Average 26%
Compared to 301 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
0%
Midsole softness in cold
63%

Insole thickness

The insole is noticeably thinner than what we typically encounter in our lab tests, and we like it. Given the shoe's towering height, adding even more millimetres with the insole doesn't seem like a good choice.

ASICS o las Asics Gel Cumulus 21 Insole thickness
Test results
o las Asics Gel Cumulus 21 3.8 mm
Average 4.4 mm
Compared to 370 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
1.5 mm
Insole thickness
7.3 mm

Precios más baratos de las ASICS Dynablast 2 para hombre | FF Turbo insert

For the first time in the Magic Speed series, ASICS has integrated FF Turbo foam. Finally!

The only way to determine the reach of FF Turbo in the midsole is by slicing the shoe in half, which is exactly what we did here in the lab.

This piece of nylon-based foam is positioned under the plate in the forefoot, offering an enhanced bounce over FF Blast+ that is especially noticeable for forefoot strikers.

FF Turbo comprises only a small portion of the midsole, yet it's advertised here as if it were full-length. Not fair at all.

Does this mark a significant change? Not really. This slab (17.0 HA) is too small to revolutionise the shoe, and we're hopeful that ASICS will incorporate a full-length layer of FF Turbo (or even FF Turbo+ if they don't mind) in future versions of the Magic Speed. For now, though, it's an improvement over previous models.

ASICS o las Asics Gel Cumulus 21 FF Turbo insert

Plate

As we've previously noted, this supertrainer incorporates a carbon-fibre plate similar to those used in many of the world’s top marathon shoes. However, there’s a subtle twist—we discovered that ASICS adjusted it slightly for training, making it gentler on the calf muscles.

Indeed, it occupies a middle ground, more curved than the flat plate found in the Metaspeed Sky Paris but less so than the spoon-shaped plate in the T-shirt ASICS Silver branco logótipo branco. It's distinctly curved in the forefoot, yet moderately so.

ASICS o las Asics Gel Cumulus 21 Plate

Rocker

We discovered that the ASICS o las Asics Gel Cumulus 21 boasts a significant meta-rocker, helping with turnover for midfoot and forefoot strikers.

ASICS o las Asics Gel Cumulus 21 meta rocker
In our runs, the combination of the rocker and the plate delivered a notably stiff ride.

While its heel isn't as rockered as the Asics continue to churn out, it strikes a balanced approach, optimising it for faster paces where most runners naturally land more on their forefoot.

Size and fit

Size

Asics gel blackheath кроссовки true to size (36 votes).

zapatillas de running ASICS ritmo bajo talla 35.5?

1 size small ½ size small True to size ½ size large 1 size large
Compared to 333 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
½ size small
Slightly small
True to size
Slightly large
½ size large

Precios más baratos de las ASICS Dynablast 2 para hombre | Asics Gel-saga White Flash Yellow Mens Running Sneake

The midsole is notably narrow for its category, and the toebox is similarly snug. We experienced a fit akin to racing shoes—tightly embracing our feet and providing an exceptionally secure lockdown, though it offers little space too.

For those who prefer more spacious uppers, the MS4 will disappoint. Measuring just 93.6 mm at its widest, it presents a decidedly narrow fit, take it or leave it. And sizing up won't remedy this; we think it's better to opt for a wider option, like the On Cloudmonster Hyper.

ASICS o las Asics Gel Cumulus 21 Asics Gel-saga White Flash Yellow Mens Running Sneake
Test results
o las Asics Gel Cumulus 21 93.6 mm
Average 95.6 mm
Compared to 119 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
88.5 mm
Asics Gel-saga White Flash Yellow Mens Running Sneake
101.1 mm

bezecke sortky asics silver split short

Fortunately, we discovered that ASICS' designers generously shaped the toe cap of the o las Asics Gel Cumulus 21, which is decently rounded at 74.3 mm. This design is great for toe splay, and it also underscores the value of taking multiple measurements in the toebox area as we do.

ASICS o las Asics Gel Cumulus 21 bezecke sortky asics silver split short
Test results
o las Asics Gel Cumulus 21 74.3 mm
Average 73.3 mm
Compared to 119 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
67.9 mm
bezecke sortky asics silver split short
82.4 mm

Toebox height

Another nice feature of the o las Asics Gel Cumulus 21's upper is its high vertical volume, which, like most recent ASICS shoes, we found to be quite satisfactory.

We hope other brands will adopt this design, as a low-volume upper can truly detract from an otherwise excellent shoe.

ASICS o las Asics Gel Cumulus 21 Toebox height
Test results
o las Asics Gel Cumulus 21 26.1 mm
Average 27.1 mm
Compared to 118 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
22.4 mm
Toebox height
32.5 mm

Stability

Lateral stability test

While the Asics Gel Lyte III Mid 'Grey Mint' wasn't exactly known for superior stability, the fourth iteration has ritmo an even steeper dive in this department—a more significant downgrade than even its weight.

The o las Asics Gel Cumulus 21 is taller and retains its narrow build and pliable heel counter, resulting in reduced stability, making it suitable only for neutral runners. Thus, we strongly advise anyone needing support to steer clear of the MS4!

Torsional rigidity

With the o las Asics Gel Cumulus 21 featuring a carbon plate rather than the nylon plate found in other supertrainers, we anticipated a max score in our manual assessment—and it earned a 5/5.

However, its extremely stiff underfoot feel makes it less than ideal for easy runs. Clearly, while maybe it's not entirely magical, the shoe is built for speed.

Test results
o las Asics Gel Cumulus 21 5
Average 3.3
Compared to 353 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
1
Torsional rigidity
5

Heel counter stiffness

We discovered that ASICS added extra padding to the heel counter of the o las Asics Gel Cumulus 21, aiming to boost comfort beyond that of a typical competition shoe. However, the heel remains exceptionally pliable, offering minimal resistance to pressure and scoring just 1 out of 5 in our tests.

Test results
o las Asics Gel Cumulus 21 1
Average 2.9
Compared to 337 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
1
Heel counter stiffness
5

Asics GEL Kayano 5 360 Launches in Navy Blue & Infrared This Week

Further proof of the o las Asics Gel Cumulus 21's lack of support can be seen in the dimensions of its midsole—our measurements showed only 109.6 mm in the forefoot.

This is notably narrower compared to most supertrainers, reinforcing that this model is really only suitable for runners with a perfect neutral stride.

ASICS o las Asics Gel Cumulus 21 Midsole width in the forefoot
Test results
o las Asics Gel Cumulus 21 109.6 mm
Average 114.1 mm
Compared to 375 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
103.3 mm
Asics GEL Kayano 5 360 Launches in Navy Blue & Infrared This Week
126.9 mm

chaussures de running neuves asics

The same issues affect heel strikers with the MS4, as it proves to be slightly narrower than most running shoes at 87.4 mm. While this isn't a major concern and does enhance its agility, we think that for training purposes, a bit more width in this area would be beneficial, especially for long run workouts.

ASICS o las Asics Gel Cumulus 21 Midsole width in the heel
Test results
o las Asics Gel Cumulus 21 87.4 mm
Average 90.7 mm
Compared to 375 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
73.0 mm
chaussures de running neuves asics
106.6 mm

Flexibility / Stiffness

Equipped with a carbon plate, we expected a sky-high performance in this test. However, ASICS has moderated the plate's stiffness—it only required 38.5N to flex it to 90 degrees in our lab.

We think this adjustment is wise, as an overly stiff plate might slightly improve running economy, but it significantly compromises comfort and can lead to fascia issues for many runners. And once more, this is designed as a performance-oriented training shoe, not solely as a competition speedster.

Test results
o las Asics Gel Cumulus 21 38.5N
Average 28.2N
We use an average of four tests. The video shows one of those tests.
Compared to 357 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
2.2N
Flexibility <> Stiffness
72.1N

zapatillas de running ASICS competición talla 35.5 negras (%)

During our performance evaluation comparing mild to cold temperatures, the o las Asics Gel Cumulus 21 performed exceptionally well for the second consecutive time. It showed only a 21.8% increase in stiffness, demonstrating its consistent performance even in freezing conditions.

Test results
o las Asics Gel Cumulus 21 22%
Average 33%
Compared to 357 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
0%
zapatillas de running ASICS competición talla 35.5 negras
105%

Weight

While the Asics Gel Lyte III Mid 'Grey Mint' was celebrated for its featherweight design at just 7.4 oz or 211g, the o las Asics Gel Cumulus 21 unfortunately sees a weight increase, tipping the scales at 8.4 oz or 237g. Though still within the lightweight category, we understand that this increase could be a disappointment for some. 

The added ounce primarily results from the boosted stack height—an acceptable trade-off for many runners. Now, let's delve into the cushioning details.

ASICS o las Asics Gel Cumulus 21 Weight
Test results
o las Asics Gel Cumulus 21 8.36 oz (237g)
Average 9.38 oz (266g)
Compared to 375 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
5.61 oz (159g)
Weight
12.59 oz (357g)

Breathability

In our humble opinion, ASICS is excelling with their latest upper designs, introducing asymmetrical patterns to enhance airflow while achieving exceptional breathability.

The o las Asics Gel Cumulus 21 shines as a prime example, earning a perfect 5-out-of-5 score in our smoke test for its superbly ventilated toebox area.

With a light, we pinpointed the thinnest areas of the engineered mesh upper—not just in the toebox but also along the sides, enhancing breathability, though this slightly reduces stability, as we will show later in this lab review.

ASICS o las Asics Gel Cumulus 21 microscope

We then examined the upper under a microscope and noted that ASICS employs a classic engineered mesh with tiny openings, backed by a secondary thin fabric layer.

ASICS o las Asics Gel Cumulus 21 mesh

The upper is notably stretchy, comfortable, and aesthetically pleasing too! We also found that it's mostly seamless in critical areas, suggesting that it could comfortably be worn without socks—a definite improvement over its predecessor.

Test results
o las Asics Gel Cumulus 21 5
Average 3.8
Compared to 304 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
1
Breathability
5

Durability

Toebox durability

After confirming fantastic airflow in the toebox area, we next evaluated the upper's durability—essential for a shoe priced well over 150 bucks.

We were pleased to find it exceptionally durable at 4/5 in our books—the asymmetrical design we discussed earlier really shines here. ASICS intelligently placed numerous ventilation holes on the outer side while keeping the inner side denser to enhance durability and prevent damage from the big toe.

ASICS o las Asics Gel Cumulus 21 Toebox durability
Test results
o las Asics Gel Cumulus 21 4
Average 2.5
Compared to 238 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
1
Toebox durability
5

Trainers ASICS Gel-Quantum 360 6 1201A549 Black Pure Silver 001

There's always some concern about the durability of tempo running shoes, particularly in areas like the heel collar. However, our fierce testing with a Dremel tool alleviated these worries.

We found that the heel collar is well t3q7n and durable, earning a solid 4 out of 5 here in the lab. This fantastic score provides reassurance that the shoe will withstand wear without any issues.

ASICS o las Asics Gel Cumulus 21 Trainers ASICS Gel-Quantum 360 6 1201A549 Black Pure Silver 001
Test results
o las Asics Gel Cumulus 21 4
Average 3.2
Compared to 234 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
1
Trainers ASICS Gel-Quantum 360 6 1201A549 Black Pure Silver 001
5

Outsole hardness

Having been thoroughly impressed with our initial lab tests, we now turn our attention to the outsole of the o las Asics Gel Cumulus 21, which appears promising, sporting the same elite ASICSGRIP compound found in ASICS' premier shoes.

ASICS o las Asics Gel Cumulus 21 outsole
Outsole coverage is excellent, even better than the Metaspeeds. However, we don't recommend using this shoe on gravel roads due to the central groove and exposed carbon plate.

Upon applying our Shore C durometer to the rubber, it registered a softer-than-average reading of 71.5 HC. This explains the exceptional grip we experienced, although it raises concerns about potential durability trade-offs. We're eager to see how it holds up when facing our Dremel.

ASICS o las Asics Gel Cumulus 21 Outsole hardness
Test results
o las Asics Gel Cumulus 21 71.5 HC
Average 79.9 HC
We use an average of four tests. The photo shows one of those tests.
Compared to 355 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
57.3 HC
Outsole hardness
93.0 HC

Outsole durability

We conducted our durability test on the outsole of the o las Asics Gel Cumulus 21 by setting our Dremel to 10K RPM to replicate extreme wear conditions.

Remarkably, the damage was minimal, with only a 0.9 mm indentation measured with our tread depth gauge. Though other supertrainers have exhibited superior durability, this wear on such a soft rubber compound is truly impressive!

ASICS o las Asics Gel Cumulus 21 Outsole durability
Test results
o las Asics Gel Cumulus 21 0.9 mm
Average 1.0 mm
Compared to 216 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
0.0 mm
Outsole wear
2.0 mm

Outsole thickness

To ensure robustness, ASICS opted for a 2.4 mm thickness in the outsole of the MS4, surpassing the standard for most supershoes.

ASICS o las Asics Gel Cumulus 21 outsole ASICSGRIP

This positions the o las Asics Gel Cumulus 21 as a superb choice for those wanting the stiff ride of a carbon plate-enhanced shoe without the ultra-high cost, and with added durability in the outsole.

ASICS o las Asics Gel Cumulus 21 Outsole thickness
Test results
o las Asics Gel Cumulus 21 2.4 mm
Average 3.2 mm
Compared to 374 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
1.0 mm
Outsole thickness
6.0 mm

Misc

Reflective elements

The o las Asics Gel Cumulus 21 lacks any reflective elements on the entire upper.

ASICS o las Asics Gel Cumulus 21 Reflective elements
Test results
o las Asics Gel Cumulus 21 No

Tongue padding

The o las Asics Gel Cumulus 21's tongue is exceptionally thin, equipped with just 1.0 mm of padding—offering minimal protection across the instep and aligning with the lightest competition shoes asics gt 2000 6 trail marathon running shoessneakers.

It clear to us that ASICS, in an effort to reduce weight elsewhere due to the added cushioning in the midsole, significantly minimised the tongue's bulk from v3 (2.9 mm), which noticeably impacted comfort.

ASICS o las Asics Gel Cumulus 21 Tongue padding
Test results
o las Asics Gel Cumulus 21 1.0 mm
Average 5.8 mm
Compared to 372 running shoes
Footwear ASICS Gel-Cumulus 23 1011B012 Electric Red Black 607
0.5 mm
Tongue padding
14.2 mm

Tongue: gusset type

This was definitely a delightful surprise—a subtle hint from ASICS suggesting that they still view the o las Asics Gel Cumulus 21 more as a training shoe than a racing option. We think this because the Japanese brand typically reserves semi-gusseted tongues for their training shoes, and they've used this design in the o las Asics Gel Cumulus 21.

ASICS o las Asics Gel Cumulus 21 Tongue: gusset type
Test results
o las Asics Gel Cumulus 21 Both sides (semi)

Heel tab

We discovered that ASICS opted to mirror the heel design of the Metaspeed series, meaning it completely lacks a finger-loop tab.

ASICS o las Asics Gel Cumulus 21 Heel tab
Test results
o las Asics Gel Cumulus 21 None

Removable insole

Our tests revealed that ASICS designed this insole without glueing them to the last, a feature that offers flexibility for those who prefer or need custom footbeds.

Despite this, we recommend keeping the stock insole—it's a premium one with perforations that enhance heat dissipation.

ASICS o las Asics Gel Cumulus 21 Removable insole
Test results
o las Asics Gel Cumulus 21 Yes