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Adidas Ultraboost 21: A Heavyweight Runner in Need of an Upgrade

CEO Tinh Phung
Image: Adidas Ultraboost 21 pieces of the shoe If you're a runner who enjoys the feeling of a sock-like trainer and prefers flat, straight courses, then the Adidas Ultraboost 21 may catch your attention. However,...

Adidas Ultraboost 21 pieces of the shoe Image: Adidas Ultraboost 21 pieces of the shoe

If you're a runner who enjoys the feeling of a sock-like trainer and prefers flat, straight courses, then the Adidas Ultraboost 21 may catch your attention. However, upon closer inspection, this shoe falls short in several areas. In this review, we'll explore the drawbacks of the Ultraboost 21 and discuss its potential for improvement.

Too Stretchy, Too Loose

Ultraboost 21 upper and lacing system Image: Ultraboost 21 upper and lacing system

One of the main concerns with the Ultraboost 21 is its lack of lockdown. While the flexible Primeknit material allows the shoe to conform to your foot, it compromises the necessary stability, especially during tight corners. Adding a welded overlay could significantly improve the shoe's performance and prevent potential accidents.

A Heavyweight Road Shoe

Weight of Adidas Ultraboost 21 Image: Weight of Adidas Ultraboost 21

Weight is another issue that plagues the Ultraboost 21. Weighing in at 12.7 ounces, it is undeniably one of the heaviest road shoes available. This added weight can dampen your performance and make it challenging to achieve your desired speed. Unless your training regimen specifically requires weighted shoes, it's best to explore lighter alternatives for a more enjoyable running experience.

Comfortable Fit, But With a Caveat

The Ultraboost 21 boasts an accommodating upper that can mold to various foot shapes and widths. The stretchy Primeknit material, combined with a flexible lace system, creates a form-fitting and comfortable experience. However, be cautious when selecting your socks, as loose or thick ones may cause discomfort and bunch up inside the shoe.

Lackluster Breathability

Transparency test on Adidas Ultraboost 21 Image: Transparency test on Adidas Ultraboost 21

Breathability is another aspect where the Ultraboost 21 falls short. Despite its high score on the light test, real-world runs reveal that the shoe lacks proper ventilation. The materials and color used in the upper could benefit from improvements to enhance airflow and prevent excessive heat buildup during longer runs.

Outdated Design Choices

External lacing system on Adidas Ultraboost 21 Image: External lacing system on Adidas Ultraboost 21

Some design choices in the Ultraboost 21 feel outdated and add unnecessary weight to the shoe. The external plastic lacing structure, although effective in providing mid-foot lockdown, is aesthetically unpleasing and contributes additional grams to the overall weight. A modernized approach utilizing welded overlays and eyelets could achieve the same result without the excess bulk.

Conclusion: Room for Improvement

We cannot help but question whether the Ultraboost 21 truly deserves its reputation as a running shoe. While the Boost midsole technology garnered praise upon its release, other brands have since caught up, offering lighter options without compromising on comfort or responsiveness. Adidas must address the weight and flexibility issues of the Ultraboost 21 to remain competitive in this rapidly evolving market. As we anticipate the Ultraboost 22, let's hope for a triumph that brings back the performance and innovation we expect.

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