Adidas Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 review

We recommend the Adidas Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 for:

• Beginners seeking a highly cushioned shoe, ideal for casual walks and some occasional light runs.
• Runners looking for a high-drop, maximalist trainer that offers surprising stability at a price that’s hard to beat.
• Admirers of the OG Switch FWD who appreciated its unique design but desired a lighter version. Well, it's here.

Despite its bouncy appearance, the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 falls short in propulsion—making it less ideal for seasoned runners seeking energy return. We've found that alternatives like the On Cloudmonster 2, The medial side of the Adidas Stan Smith Boost Primeknit in white collegiate navy On Cloudsurfer 7, which offers a more balanced experience, delivers a more energetic ride with a similar midsole design.

Additionally, the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376's high drop may not appeal to runners in search of a less steep shoe. For those who prefer a lower offset coupled with a softer feel underfoot, we recommend considering the ASICS Novablast 4 or the New Balance Fresh Foam X More v5.

One of the first things we noticed when testing the original Switch FWD series was that the heel stack fell short by 5.2 mm from the advertised height. That’s been fixed too.

We clocked a massive 44.0 mm heel stack in the updated version, and it’s almost comical to look at. We also found that it provides endless cushioning, making it a dream for heavyweight heel strikers.

The forefoot is also impressively tall, and comes in at 32.3 mm, which isn’t as striking as the heel but still cements this shoe’s place as a true maximalist daily trainer.

It’s also worth noting that while the forefoot isn’t as high as the heel, it has fewer cutouts in the midsole, meaning the overall net cushioning is similar.

Just by looking at the cut-in-half Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 in our lab, it’s clear this is a high-drop running shoe. Naturally, we wanted to verify the exact number, and it comes in at 11.7 mm. We found that this makes the shoe much more suitable for heel strikers.

The most intriguing aspect of the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376, at low on paper, is its On-like midsole design, which immediately stands out from what we typically see in both the lab and on the streets. It promises something different, but the question remains—is it actually any good?

The answer is a bit complicated. Visually, the midsole gives off the impression of being bouncy and reactive, but in reality, it falls short. The EVA foam isn’t as resilient as it appears, and despite its design, there isn’t as much forward propulsion as you might expect.

Adidas did improve the overall softness from version 1, changing the foam softness from 27.3 HA to 23.5 HA, but it doesn't fully translate into a significantly softer ride. In fact, the experience still leans toward the firmer side, and we know this comes down to the TPU plate that's above the midsole.

We tested the FWD 2 in cold conditions by placing it in the freezer for 20 minutes. The foam's softness changed by 27.1%, which we consider a typical change for EVA compound

The insole is made from recycled EVA foam and is one of the few elements in this shoe that seems to be fairly standard. It measures 4.8 mm in thickness, providing a straightforward, no-frills design.

Adidas incorporated a rigid TPU plate above the midsole in the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376, positioned directly below the insole, and giving a firmer sensation than the foam alone would provide.

While the plate is essential for stability—especially with the tall platform and midsole design—we believe that comfort could be improved with a slightly thicker insole to soften the ride without sacrificing the needed support.

With its unconventional design, the fit of this shoe could have gone any direction, yet, our initial width measurement in the lab delivered an average 99.2 mm—consistent with many running shoes.

However, it's crucial to note that the upper doesn't accommodate larger feet well, with noticeably limited vertical volume. Unfortunately, sizing up doesn't alleviate this issue.

On a positive note, the toebox of this model doesn't taper as sharply as other Adidas Adidas x bw army oyster triple white mens 4.5 womens 5.5 bc0545.

In fact, with a width of 78.9 mm, it provides more room in this area compared to many competitors' models!

The Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376, despite its towering height and somewhat narrow appearance—especially from the back—surprised us with its impressive stability. We found this to be one of its standout and unexpected features!

Several features enhance the stability of the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376, including its firm EVA foam. And another thing that contributes in terms of support is its high torsional rigidity. We tested it manually and gave it a 4/5 rating for resistance to bending—thanks to the full-length TPU plate that Adidas integrated.

We found that the heel counter of the FWD 2 strikes a great balance in terms of stiffness. It’s moderately firm, which we rated at 3/5, providing enough support without feeling overly rigid. This makes it suitable for a variety of runners, ensuring both stability and comfort!

What truly caught our attention after initially examining the midsole was the incredibly wide forefoot. We measured it at 122.4 mm, offering an impressively broad landing platform.

Most runners can benefit from its stability and cushioning, although as we said before in the "drop" section, it's better suited for heel strikers or midfoot/forefoot strikers who need a higher offset.

We were taken aback to find that, despite the expansive forefoot width clocked at a staggering 122.4 mm, the heel measured a mere 89.4 mm—quite average by comparison! This design choice by Adidas is a bit puzzling, particularly as this shoe caters primarily to heel strikers and it's uncommon to see such a discrepancy between forefoot and heel widths.

However, the shoe runs more stable than its appearance might suggest, which could be attributed to its overall weight. Balancing a broader build without increasing weight seems to have been a challenging feat for Adidas.

The Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 reaffirms a recurrent finding from our lab—contrary to popular belief, neither TPU nor nylon plates significantly enhance longitudinal stiffness in shoes. This model flexed effortlessly under a mere 18.9N in our 90-degree test, making it quite suitable for casual wear—if you can handle the looks, of course.

The flexibility is largely due to the numerous cutouts throughout the midsole and outsole, which serve multiple purposes, including reducing the shoe’s rigidity, as demonstrated here.

The FWD's stiffness increased up to 38.5% under cold temperatures. However, this is a typical response for a shoe with an EVA midsole, which is known to harden in lower temperatures. 

One of the major downLuxe of the original Switch FWD was its hefty weight—11.4 oz or 323g felt excessive, especially for a shoe with so many cutouts in the midsole. Thankfully, Adidas fixed that.

Now at 10.2 oz or 288g, we're much more satisfied with this superb weight reduction. However, this improvement comes at the cost of outsole durability. But if you found the first version clunky and prioritize weight, this update might offer the lighter feel you’ve been waiting for!

Upon initial inspection, we thought that the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 seemed less than ideal in terms of breathability. The upper, constructed from a thicker engineered mesh without noticeable holes, suggested potential issues in air flow. So, we brought our lab tools to the test to confirm our impressions.

Our smoke-pumping machine offered concrete evidence—the FWD 2’s breathability indeed falls short. Achieving only a 3/5 rating, this result is below average for a road running shoe, indicating that the shoe performs better in cooler conditions rather than during hot summer runs.

Further testing involved illuminating the upper with a strong LED light to see how much passed through. While some light filtered through the toebox, the majority of the shoe presented a dense and structured material composition that effectively retains heat, not ideal for high temperatures.

Under the microscope, we discovered tiny vertical gaps strategically placed by Adidas to try to enhance ventilation. Although these gaps provide some relief, their impact is not enough, yet without them, the shoe’s breathability score would have likely been disastrous.

The overall breathability and structure of the upper also revealed it's not designed for sockless running at all. It lacks the necessary stretch and padding found in more forgiving trainers and includes several exposed seams that could cause discomfort, confirming our initial observations.

Once we accepted the lack of breathability in this upper, we turned our attention to durability, often a strong suit of denser fabrics. And we were especially hoping for a better result this time, as the first-gen Switch FWD performed poorly in this test.

We put it through its paces with our Dremel set to 3.2N of force and 5,000 RPM. We found that the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 held up decently, earning a respectable 3/5 score, placing it in the middle of the pack for durability. While it wasn’t outstanding, it proved capable of handling the challenge!

The heel collar of the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 has a unique design—extra padding on the interior locks in the Achilles, preventing any heel slip, while the collar extends higher.

When it came to durability, it outperformed the toebox, scoring a solid 4 out of 5 in our tests. We believe that this design ensures both comfort and long-lasting performance.

The outsole has seen significant changes from the previous generation, though not all for the better in terms of design—it remains a real rock-catcher due to the big gaps that extend up to the insole.

When it comes to grip, however, it excels thanks to the famous Continental rubber.

Interestingly, Adidas didn't stamp the Continental logo on the outsole like in the first version. We tested the rubber and found it's a softer blend than expected—72.6 HC—which could impact durability over time.

Our worst fears were confirmed when we used the Dremel for the third and final time in today's lab session.

After the tool finished, we found a disappointing 1.6 mm mark in the rubber. This is undeniably a bad result and a clear downgrade from the first generation.

We found that the rubber is just 2.3 mm thick—1.0 mm thinner than in v1—making this shoe difficult to recommend for runners who wear down outsoles quickly.

As we mentioned earlier, the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 is notorious for catching pebbles. We can only recommend it for smooth, rock-free asphalt.

We also noted a significant reduction in ground contact surfaces compared to other shoes, meaning wear and tear will likely happen faster than in most daily trainers. This could be a dealbreaker for those looking for longevity in their footwear.

One aspect of this shoe that doesn't look weird is its price—surprisingly, it matches the average cost of other running shoes in its class and notably avoids a price increase from the previous version, which is a rare find in today's market!

Few daily trainers incorporate reflective features, yet the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 stands out—its large Adidas stripes not only catch the eye but also reflect light, enhancing safety during your runs.

The tongue of the OG Switch FWD was one of its best features for its comfort and streamlined design. And we were pleased to discover that the second generation maintains the same 5.0 mm padding.

In our experience, this is the ideal setup for daily use—perfectly balancing lightness with comfort and avoiding any bulkiness. Although the hybrid lacing system isn't the best we've encountered in the lab, mainly due to its lace loops, it still performs effectively.

It's not common for a shoe priced at $140 to feature a tongue that's fixed to the Luxe—yet, we discovered that the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 does just that, much to our delight.

While the heel of the Adidas Adizero Ubersonic 3 Parley Blue Spirit CG6376 is impressively cushioned, it misses a heel tab—a convenient feature found in the Adidas Adizero adidas Floral Graphic Hihaton T-paita.

We encountered no problems replacing the insole of the FWD 2, and it's a change that probably won't be harmful—since the original footbed is quite basic.