Ultraboost and adidas 4D are not two directly equivalent shoes. Ultraboost is a footwear family spanning several generations; 4D is a midsole platform used in products such as Futurecraft 4D, 4D Run, Ultra 4D, and 4DFWD. The answer therefore depends on the specific models being compared.
The construction difference is straightforward: Ultraboost uses BOOST or Light BOOST foam, while 4D uses an open elastomeric network. To put weight and geometry into context, compare the Ultraboost 5 and 4DFWD 4 below rather than assigning one feel to each family.
Ultraboost vs. 4D: the quick answer
A comparable example in adidas’ official specifications is the Ultraboost 5 ID8810 versus the 4DFWD 4 ID8886. Both weights below use adidas’ men’s UK 8.5 reference size:
| Specification | Ultraboost 5 ID8810 | 4DFWD 4 ID8886 |
|---|---|---|
| Midsole | Light BOOST V2 | 3D-printed 4D structure |
| Stated weight, UK 8.5 | 292 g | 309 g |
| Stated drop | 10 mm | 11 mm |
| Stated stack: heel/forefoot | 39/29 mm | 30/19 mm |
In this comparison, the Ultraboost 5 weighs 17 g less per shoe and has a higher stated midsole stack. These numbers help compare the designs, but they do not measure comfort or demonstrate that either shoe improves a runner’s performance.
- Want to try Light BOOST? Compare a recent Ultraboost with your usual shoe; softness and flexibility depend on the generation and the complete construction.
- Want to try a lattice? Find a 4DFWD intended for your activity and assess its response while walking or running.
- Want a shoe for walking and everyday use? Prioritize fit, weight, and a comfortable transition, then compare available prices in your size.
- Specifically want the look of an open midsole? 4D models are a closer match for that aesthetic preference.
- Planning to run? Compare two models categorized for running, considering weight, geometry, drop, fit, and workout type. Do not choose by technology name alone.
- Found an Ultra 4D or Ultra 4DFWD? These are more than simply Ultraboost “rivals.” They combine elements associated with both design approaches.
Before comparing: Ultraboost and 4D are different categories
The first Ultraboost launched in 2015 as a running shoe with a BOOST midsole. Since then, adidas has changed cushioning geometry, quantity, and formulation, along with uppers, support systems, weight, and positioning across versions. An Ultraboost 20, for example, should not be treated as technically identical to an Ultraboost 5 or 5X.
adidas 4D was publicly introduced in 2017 with Futurecraft 4D, developed with Carbon. Here, “4D” primarily identifies a manufacturing process and a lattice midsole platform. That platform appeared in several shoes, including the AlphaEdge 4D, 4D Run 1.0, and 4DFWD generations.
A responsible comparison therefore needs to answer two questions: which Ultraboost, and which 4D shoe? Without naming the models, you can only discuss tendencies and selection criteria, rather than universal winners.
To locate each component within a shoe’s construction, see our sneaker anatomy guide.
What is BOOST, and how did it evolve into Light BOOST?
Traditional BOOST is a cushioning technology based on expanded thermoplastic polyurethane particles, recognizable by the midsole’s granular appearance. The platform predates Ultraboost and has also been used in other adidas families.
Light BOOST changed the comparison in more recent generations. When adidas introduced the Ultraboost Light in 2023, it stated that the new material was 30% lighter than the BOOST used in earlier Ultraboost generations. This was a specific promotional comparison from the brand; it does not mean every Light BOOST Ultraboost is 30% lighter than every BOOST model ever made.
The Ultraboost 5 and Ultraboost 5X are recent examples associated with Light BOOST. Specifications may vary by men’s or women’s version, region, and catalog update. Check the Torsion System, upper type, and rubber coverage on the chosen product’s page rather than assuming they are identical across the family.
Our adidas Boost technology guide explains the cushioning’s origins and evolution in more detail.
What is adidas 4D, and how is its midsole made?
An adidas 4D midsole should not simply be described as “3D-printed foam.” It is a lattice of interconnected cells and elements produced with Carbon’s Digital Light Synthesis technology.
The process projects light through an oxygen-permeable window to shape a light-sensitive liquid resin. After printing, the part undergoes post-processing to develop its final properties. Across platform generations, Carbon and adidas have used elastomeric polyurethane materials developed for this application.
Digital geometry allows the lattice arrangement to be controlled in different midsole regions. That does not mean every retail pair is customized for its buyer, or that all 4D midsoles share the same design or behavior.
adidas connects 4D development with athlete data and structural simulations. Those statements explain the design process, rather than proving that any 4D model is automatically better for every runner.
Read the complete explanation in our article on adidas 4D technology.
Are Futurecraft 4D, Ultra 4D, and 4DFWD the same thing?
No. Futurecraft 4D was the application introduced in 2017 and served as the public starting point for the adidas and Carbon partnership. Later models changed both the midsole design and the rest of the shoe.
Ultra 4D
Ultra 4D combined a silhouette and upper related to Ultraboost with a 4D midsole. Its existence shows why “Ultraboost or 4D” does not necessarily describe opposing categories: elements of both concepts can appear in the same product.
4DFWD
4DFWD is a running-oriented development. Its lattice uses cells adidas calls FWD Cell, with geometry designed to deform forward under a particular load. The brand’s claims about reduced braking forces and forward motion come from adidas-defined tests and conditions; they do not guarantee improved performance for everyone.
Ultra 4DFWD
Ultra 4DFWD is also a combination: Ultraboost-related design references paired with a 4DFWD-platform midsole. It should not automatically be confused with a conventional Ultraboost or the original Futurecraft 4D.
Which is softer: Boost or 4D?
The midsole’s appearance cannot tell you how soft every generation is. Without comparing two models under the same testing protocol, there is no basis for saying every Ultraboost is softer than every 4D.
Softness depends on material formulation, thickness, midsole geometry, contact area, overall stiffness, and applied weight. A lattice can also be tuned to deform in different ways. “4D” therefore does not correspond to one firmness level, just as “BOOST” does not describe one feel across all generations.
It is also important to separate softness from performance. A softer shoe is not automatically more efficient, stable, or suitable for running. Likewise, a firmer feel does not establish greater clinical support or injury prevention.
Stability and structure
A lattice allows mechanical response to vary by region, but that does not prove greater stability than foam. Compare the complete shoe.
It is inaccurate to say every 4D is more stable. Perceived stability also depends on base width, midsole height, heel design, torsional stiffness, upper, and foot fit. The Ultraboost 5X, for example, has a different construction from early generations and includes its own control and transition features.
If you dislike a highly compressible platform, try the options before choosing. Perceived firmness is not a clinical recommendation.
Weight and flexibility
Early 4D applications became known for relatively heavy constructions, but that weight cannot be attributed to the entire platform. 4DFWD received material and geometry changes, while the Ultraboost line also became lighter with Light BOOST.
A valid comparison uses weights for the model, version, and size reported by the same source. A men’s shoe in one size should not be compared directly with a women’s version or another size.
Flexibility also depends on the outsole and structural elements. The visible lattice alone does not determine how much the whole shoe bends during a stride.
Upper, fit, and sizing
There is no sizing recommendation that applies to the entire Ultraboost family or every 4D shoe. adidas has used different knit, PRIMEKNIT, PRIMEKNIT+, and mesh constructions, with changes in internal volume, cage, heel counter, and opening.
Before buying, check the model’s product-page guidance and compare your foot measurement with the correct regional size chart. Pay particular attention to:
- space in front of the toes;
- forefoot width;
- pressure over the instep;
- heel hold;
- midfoot volume;
- the socks you will wear for walking or running.
Do not buy a tight pair expecting it to “stretch out.” Textiles may settle with wear, but that varies by construction and does not correct insufficient length or excessive pressure.
Breathability depends on the upper
BOOST and 4D are in the midsole, so they do not determine ventilation on their own. Breathability mainly depends on the upper fabric, lining, reinforcements, tongue, and fabric density.
A 4DFWD with a lightweight upper may ventilate better than an Ultraboost with denser knit, while another comparison may show the opposite. Check the specific model and avoid choosing solely by cushioning technology.
Ultraboost vs. 4D for walking
For walking, try how the shoe bends at your pace and whether it supports the foot comfortably without midfoot pressure. The Ultraboost 5 and 5X began as running models, but can also be considered for everyday wear.
A 4D model makes sense when its construction and fit suit the wearer. The lattice is a genuine design difference, but does not guarantee less fatigue or greater stability.
To compare those differences, try both models with the same socks and walk at your usual pace. A short try-on cannot guarantee comfort for hours, but it can reveal looseness, pressure, or a transition you dislike.
Ultraboost vs. 4D for running
Both Ultraboost and 4DFWD include models officially positioned for running, but that does not make them equivalent. Runners need to compare the available generation, reference-size weight, stated drop, fit, and intended workout.
- Easy runs and daily training: recent Ultraboost versions may suit runners who like Light BOOST, provided the weight and fit meet their preferences.
- The specific lattice experience: 4DFWD was developed for running and offers different mechanics from the earliest 4D midsoles.
- Fast paces and racing: do not assume Ultraboost or 4DFWD is ideal simply because of the technology. adidas has other families designed for speed and competition.
Drop and weight should be accompanied by the complete model name and measurement reference size. Because they vary, there is no universal number for “Ultraboost” or “adidas 4D.”
Casual and lifestyle use
Ultraboost crossed from running into casual fashion, but every generation has its own design. Versions inspired by the early editions often look different from current running models.
On 4D products, the exposed lattice is the main visual feature. It can appeal to anyone who wants an open structure, while different Ultraboost generations offer their own upper and midsole designs. For casual use, style, fit, and availability matter more than a supposed technical winner.
Durability: what should you actually assess?
There is not enough basis to say every 4D midsole ages better than BOOST or every Ultraboost loses responsiveness sooner. A durability assessment needs to separate:
- outsole rubber wear;
- midsole marks and visual changes;
- compression or structural damage;
- upper and seam integrity;
- the bonds between upper, midsole, and outsole.
Continental Rubber appears on specific models, including certain recent Ultraboost and 4DFWD versions, but should not be assumed for every product in either family. Check the exact product code you plan to buy.
The open lattice also needs care during cleaning, because dirt can lodge in its spaces. Follow the model’s official instructions and avoid harsh chemicals or drying methods that could damage the materials.
Which is easier to buy in 2026?
As of October 5, 2026, adidas’ U.S. Ultraboost range lists the Ultraboost 5X, while its 4DFWD 4 page for SKU JI1452 marks that item sold out. These examples do not establish stock levels across either family or every retailer. The Ultraboost 5 and 4DFWD 4 specifications compared above remain tied to their exact product codes.
Historical models such as Futurecraft 4D and Ultra 4D have their own distribution cycles. When you find an older pair, check the generation, condition, and exchange policy.
Price is not a permanent property of the technology, either. An older 4D on clearance may cost less than a current Ultraboost, while a rare edition may cost much more. Compare price, condition, exchange policy, and availability when you buy.
The verdict: Ultraboost or 4D?
Start with Ultraboost if you specifically want a Light BOOST midsole. Include 4DFWD if you want to try a lattice. In either case, choose the complete model rather than a supposed universal technological advantage.
Keep exploring
For a closer look at the components and systems mentioned in this comparison, visit our Sneaker Lab.
