The Run Testers Examine the New Adidas UltraBoost 21: A Comprehensive First Run Review

In their latest video review, The Run Testers, a YouTube channel dedicated to providing in-depth insights into running gear, delves into the highly anticipated Adidas UltraBoost 21. The team, led by Nick, kicks off by sharing the UltraBoost 21's vital statistics, highlighting its UK pricing at £160, US pricing at $180, a heel-to-toe drop of 10 millimeters, and a weight that is considerably hefty at 361 grams for a UK size 9, which translates to about 12.7 ounces. The UltraBoost 21 features an increased stack height of 30.5 millimeters at the heel and 20.5 millimeters at the toe, marking a noticeable increase from its predecessor, the UltraBoost 20.

The Run Testers focus their attention on the design, specifically the Primeknit+ upper which is constructed using 50% Primeblue yarn, a material sourced from 75% recycled content, reflecting Adidas' push toward sustainability. The reinforced knit aims to provide a snug fit that counters the slippage often associated with knit uppers, especially when taking sharp turns. The shoe also features a 'bootie' style with ample padding around the Achilles to prevent chafing and sports the UltraBoost's signature plastic midfoot cage. Nick points out his initial concerns about the cage, as it caused slight discomfort on his left foot during the first run, yet he remains hopeful that this won't persist after proper lace adjustments.

Delving deeper into the performance aspect, the midsole is where the UltraBoost 21 truly stands out. The shoe boasts an additional 6% of Adidas' proprietary Boost foam compared to its earlier version, part of which contributes to its prominent heel design. Furthermore, the introduction of the Linear Energy Push (LEP) system is a significant innovation, which includes a yellow shank that runs under the midfoot to the forefoot, aiming to add a responsive snap during foot stride. Nick remarks on the system's effectiveness during his run, noting a pleasant rocker effect despite the high stack and weight of the shoe. He wraps up by examining the outsole, which now sports a new design and uses crystal rubber instead of the standard Continental rubber, yet still offers the exceptional grip and durability expected from the UltraBoost series.

Watch the full review by The Run Testers for a detailed first-hand perspective of the Adidas UltraBoost 21: https://www.youtube.com/@TheRunTesters

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YouTube channel - The Run Testers: https://www.youtube.com/@TheRunTesters

Men's Running Shoe by Adidas - Ultraboost 21