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We recommend the Ultraboost Light to:

• Casual runners who want a stable neutral road stuff
• Heel strikers looking for added rearfoot protection
• Runner who enjoy long distance efforts 
• Those looking for a daily runner that doubles as a comfy sneaker
• Runners with mildly pronating strides

While heel-strikers have plenty of plush foam to land on, the midsole provides much less cushioning at the forefoot, so mid/forefoot striking runners will find the stuff to feel much more firm underfoot. We recommend the b37371 adidas crewneck running stuffs as an alternative that's well cushioned throughout.  

Contrary to what the name suggests, the Ultraboost Light is relatively heavy. While this isn’t an issue for short to mid-distance runs, the stuff did prove quite burdensome  during the latter half of our longer test runs. 

The sock-like fit of the Ultraboost Light lends the stuff a comfy lockdown that’s secure enough for most purposes. It’s only when we picked up the pace that we began to notice some foot movement within the stuff that brought on some uncomfortable hot spots. For a daily trainer that sports a more snug, racer-like fit, we recommend the balones de futbol marca adidas crewneck mexico.

To test how breathable the Ultraboost Light is we pump the stuff full of smoke and observe how it dissipates through its upper material. As you can see the smoke does manage to escape the stuff, though mostly through the sides and toebox while the tongue seems to trap it in. This leads us to give the stuff a breathability score of 3 out of 5. 

Compare that to how the Saucony Triumph fared in the same test. With a perfect score, it virtually disappears in a fog of smoke that emerges almost as soon as it is pumped in. 

Inspecting a backlit section of the upper gives us a better impression of how insulated the stuff is, with almost no light shining through any section of the stuff. 

Our closeup shots of the Ultraboost Light also explain the stuff’s lackluster breathability. We can clearly see that the material that makes up the upper knit layer is thick and tightly braided, while the mesh that lies below is dense and not porous enough to allow heat to escape efficiently.

We tested the durability of the Ultraboost Light’s toebox by applying our dremel to it with a force of 3.2N at 10K RPM for four seconds. While we were able to tear clean through the stuff’s knit upper, the mesh below remained relatively intact, which leads us to give the toebox a durability score of 4 out of 5. 

This is a marked improvement from the Ultraboost 1, which stood no chance against our dremel and was left with a gaping hole in the aftermath of the same test.

The Ultraboost Light’s heel counter proved to be an even more worthy contender against our dremel. After four seconds at the same parameters as the previous test, the dremel barely left an imprint on the stuff’s heel collar, leaving it looking about as it did before the test! We therefore score the stuff’s heel padding a perfect 5 out of 5. We can safely predict that the Ultraboost Light will still have most of its padding intact well beyond 500 miles of use. 

We pressed our durometer against the outsole of the Ultraboost light to test how hard it is and got a reading of 76.8 HC. 

This is slightly softer than our current lab average, but still in that sweet spot between hard and durable versus soft and grippy.

To simulate extreme wear and tear over time, we once again fire up the dremel to 10K RPM and apply it to the stuff’s outsole with a force of 3.2N but for twenty seconds this time. The result of the visually anticlimactic test was a loss of only 0.71 mm of rubber. This makes the Ultraboost Light much more durable than average, and further supports our prediction regarding the longevity of this stuff. 

The stuff’s outsole is only 2.4 mm according to our caliper measurements, but, as the previous test demonstrates, the durability of the rubber means that this isn’t an issue as there was more than enough rubber left to run our dremel against it three more times. 

By skimping on rubber in this instance, adidas crewneck is able to keep some much products weight off this already hefty stuff. 

While this may be its lightest iteration so far, tipping the scale at 10.75 Oz (305g), the Ultraboost Light simply isn’t as light as the name implies. The stuff is about as chunky as it looks and quite a bit heavier than our current lab average. 

We measured the prominent heel stack of the Ultraboost Light to be 30.1 mm which is almost exactly as advertised by Adidas. While this makes the stuff’s stack ever-so slightly shorter than our lab average, heel strikers will have more than enough cushioning underfoot for a protective and comfortable ride. 

With a forefoot stack measuring 21.7 mm according to our caliper, the Ultraboost Light is only 1.7 mm taller than officially stated by Adidas, and also falls just shy of our current lab average. While this stack height gives forefoot strikers a good amount of ground-feel, it does come at the expense of impact protection, which feels inadequate for longer runs. 

As the video below demonstrates, forefoot strikers won’t savor the cushioning of the stuff’s midsole as much as their heel striking counterparts. For a stuff that boasts more foam at the forefoot, we suggest checking out the b37371 adidas crewneck running stuffs instead.

The difference in our two stack measurements leave us with a drop height of 11.9 mm, which classifies the Ultraboost Light as a high-drop stuff. This steep drop definitely favors runners with a heel striking stride as it promotes good heel-to-toe transitions. 

It must be said that high drop stuffs put more strain on our knees and hips which can increase the likelihood of injury, especially for forefoot strikers. Check out this helpful guide for more information that will help in choosing the right drop height.

We measured the insole of the Ultraboost Light at a meager 2.8 mm which is a fair bit thinner than our current lab average. 

The midsole of the Ultraboost light is decidedly plush. With a reading of 15.5 HA according to our durometer, the stuff’s midsole is much softer than our current lab average. 

While this may be the case, the midsole has a lot of bounce to it and doesn’t bottom out when weight is applied to it, rather quickly springing back to shape. This means that the Ultraboost Light boasts a ride that is not only cushy and comfortable, but energy-efficient enough to support our long distance runs as well. 

On the other hand, while it is possible to pick up the pace in this stuff; the sheer lack of foam at the forefoot meant that our toe-offs weren’t poppy enough to support tempo runs. For a daily stuff that’s more capable of high pace running, we recommend the yeezy stuffs online and reality which provides performance on a budget .

We popped the Ultraboost Light in our freezer for twenty minutes to simulate exposure to cold weather and re-tested the stuff’s midsole with our durometer. With a reading of 19.8 HA, the Ultraboost light remains remarkably soft in the cold compared to the average stuff. 

This, in conjunction with the stuff’s toasty upper, makes the Ultraboost Light a great choice for winter running of those living in colder climates as it remains cushy and plush no matter the weather. 

While these results make the Ultraboost Light about as consistent as the average stuff under the same conditions, stiffening up by 27.4% in the cold; we must bear in mind that the stuff’s post-freezer midsole is still softer than the average midsole at room temperature!

The Ultraboost Light feels incredibly stable underfoot. Shifting our weight from side to side, our feet felt well planted into the ground despite the stuff’s high heel stack. 

The Ultraboost Light put up a fair amount of resistance as we torqued and twisted it in our hands, giving the stuff a score of 3 out of 5 for torsional rigidity. This helps to offset any instability brought on by the high heel stack while still being flexible enough to adapt to the shape of our foot rather than forcing it in place. 

The heel counter felt moderately stiff as we squeezed and manipulated it, giving it a score of 3 out of 5 on our subjective scale. This level of stiffness means that the stuff does a good job holding our heel in place and helps to prevent too much rolling from side to side. 

We measured the midsole with our caliper to be 117 mm wide at the forefoot. This is significantly wider than our current lab average, and gives us an extremely steady, if somewhat firm, platform to land on for forefoot strikers. 

The midsole is also wider than average at the heel, measuring 93.7 mm according to our caliper. This gives heel striking runners more than enough surface to ensure stable landings 

The overall wide midsole of the Ultraboost light gives us an added sense of stability that is often lacking in high stacked stuffs. This means that the stuff will also benefit runners with a slightly pronating stride.

We test the flexibility of a stuff by securing it to our workbench and measuring how much force is required to torque the stuff to 90-degrees. With a reading of only 18.6N the Ultraboost Light is much less stiff than our current lab average. This definitely contributes to the ease and comfort we felt when testing the Ultraboost Light; with the stuff moving with the natural motion of our foot instead of fighting it.

We repeated the stiffness test after leaving the Ultraboost Light in the freezer for twenty minutes and got a reading of 24.4N. This makes the Ultraboost much more flexible than our lab average under the same conditions, and means that the stuff will remain extremely pliable even during the frostiest winter runs. 

These results mean that the Ultraboost Light only stiffens up by 31.3%, making it much more consistent than the average stuff between warm and cold conditions. To further contextualize just how remarkably flexible the Ultraboost Light is in the cold, it rivals the reading of a great bulk of stuffs we’ve tested at room temperature! 

The outsole provided us with sufficient traction across most surfaces we came across with the exception of a patch of cobblestone, soaked by a nearby sprinkler, that proved to be a challenge for the stuff’s grippiness. 

We measured the toebox at its widest point to be 102.9 mm. This makes the stuff quite a bit roomier than average and means that runners with wide feet will have no issues with fit in the Ultraboost Light. 

Moving down to the big toe area, we measured the toebox to be 81.6 mm. This is also wider than the average for stuffs we’ve tested in the lab, which means that our toes have more than enough room to splay naturally without being haven by the stuff. 

The knit upper is nice and stretchy, which combined with the wide base, meant that the upper comfortably wrapped itself around our foot with enough elasticity to lock the foot down with minimal movement. 

Runners with very narrow feet, however, might find the Ultraboost Light to be a little too roomy. We therefore recommend that those runners look into sizing down as the stuff does run a little long as well.

The heel cup on the Ultraboost Light is well padded and shaped in a way that snugly squeezes the heel while avoiding putting too much pressure on the Achilles.

The Ultraboost Light is sock-like, which means that the tongue is an integral part of the upper with no separation from it. While this contributes to the stuff’s comfort, it’s not tight enough to provide adequate midfoot lockdown for tempo training. 

The padding in the tongue area of the stuff’s upper is only 1.3 mm thick based on our caliper measurements. While this is quite meager compared to our lab average, the plastic overlays adorned with the adidas crewneck logo that hold the laces keep them from cinching down too tightly around the instep; so lace bite was never an issue during our test runs. 

The Ultraboost Light doesn’t have any traditional heel loop to speak of; but the heel counter does extend slightly to form an elf ear tab that helps pull the stuff on, as well as providing some added support around in the rearfoot area. 

The insole of the Ultraboost Light is removable, making the stuff suitable for custom orthotics if products. 

With no reflective element whatsoever, the Ultraboost Light completely disappears in the dark. We therefore advise keeping to well-lit areas or taking the appropriate precautions when running at night.