Adidas UltraBoost 21 Review (2021): Should You Get It?

The sleek design is an achievement on its own and will please runners who like good-looking shoes on their feet. The Primeknit upper and its bootie conception offer great comfort and impeccable foot lockdown, according to the testers. It’s both breathable and stretchy for a precise and adaptive fit. Also, the Primeblue material uses 50% of recycled plastic from the oceans. The UB21 also marks the midfoot plastic cage’s return that many runners decried in the past on previous versions. However, luckily it’s barely noticeable this time.

Then, the cushioning shifts gear with a heel stack height of 31 mm instead of 27 mm the year before. Adidas announces 6% more Boost, and it shows: the small white TPU granules give a massive sole, especially in the heel area. Another significant change, the Linear Energy Push plastic plate, replaces the Torsion System of the previous models. It gives structure to the platform for better stability and a snappier toe-off. However, in practice, testers found the cushioning firm and clunky, with little bounce, although the shoe provides a stable ride. The weight doesn’t help with 12.3 oz (348 g) (even more than the previous model), limiting its speed ambitions.

Finally, the outsole also boasts a new design and succumbs to the exposed foam trend (only in the center) without limiting durability or grip, both of which are very good.

In summary, unless you’re a fan of the UltraBoost collection, there’s little reason to opt for the UB21 other than its comfortable lockdown, good shock absorption, and sleek design. Otherwise, the Ultraboost is too heavy and too stiff for an enjoyable ride, even for daily runs.