![]() Heel landings combined with the soft Boost are very cushioned, soft and smooth once the shoe breaks in. The bevel in the heel is fairly aggressive. The Ultraboost 21 is very rockered, with a significant heel bevel and toe spring. This is a bit of an odd sensation at first, but once the pace picks up the shoe rolls along nicely. As it breaks in, the heel softens, but the forefoot, thanks to the LEP system, remains firm and snappy. The whole shoe takes a few miles to break in and is initially firm for a shoe with so much Boost. Matt: The Adidas Ultraboost 21 has a very soft feel in the rear and a stiff and more responsive ride up front. I have not tried this shoe sockless secondary to how stiff the 3D Heel frame was. So overall this upper is very secure with a snug primeknit upper that still has enough width in the forefoot and midfoot (which stretches with time) and a snugger fit in the heel. I do like this modified version as it will provide a high level of medial and lateral stability (more on that later) without direction pressure on the Achilles insertion. The 3D heel frame is similar to previous models, where two external heel counters sit on either side of the heel while the Achilles tendon is left untouched. There is no tongue as this is a one piece upper and there is no last eyelet to lace lock the shoe. So don't take them off because the fit is better with that lockdown. What I found is that the laces connect with the three stripes logo to improve lockdown further around the midfoot. With the one piece upper, I wondered if I actually needed to lace the laces, which prompted me to take them off and run without them. With the 3D heel frame, the heel fits fairly a little tighter initially then opens up. The fit is a bit wider despite the low volume, but does stretch in the midfoot and forefoot. Once it does, it feels more sock like in a customized way. The upper does stretch and needs a few runs to break in. There is a decent amount of room throughout the shoe, but the PRIMEBLUE upper is very low volume and fits very closed to the foot. Matt: The Ultraboost 21 fits me very try to size if slightly short in my my normal men's size 10. The upper fits very sock like and utilizes recycled Parley Ocean plastic with no virgin polyester. The shoe features 6% more boost through the heel and the shoe provides great protection on foot. The shoe utilizes a new LEP torsion system that helps stabilize the sheer amount of boost midsole while also increasing responsiveness. However the Ultraboost 21 is best for long runs, easy runs and occasional fartlek workouts when you want something snappy with a ton of protection.ĭavid: The Adidas Ultraboost 21 continues upon the long lineage of boost midsole trainers from Adidas. With a rockered platform due to a stiff but snappy toe off, this shoe can still move if you push it. A surprisingly responsive shoe that rides far lighter than it weighs, this is a protective but slightly aggressive ride. Featuring an aggressive LEP torsion system, and incredible amount of boost and a snug socklike PRIMEBLUE (primeknit?) upper. Matt: The Adidas Ultraboost 21 is a serious move forward for the series.
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