adidas UltraBoost 21 'Tokyo' - White/Black - UK 7

The Ultraboost 21 'Tokyo' features 6% more Boost capsules in the midsole for enhanced energy return and a slightly different Torsion System for improved support.

The Primeknit upper offers some flexibility, but the shoe is designed for a snug, adaptive fit. Runners with very wide feet might find them restrictive. It is recommended to try them on or consult sizing guides carefully.

Gently hand wash with cold water and mild soap. Avoid harsh scrubbing or machine washing to preserve the material's integrity and the shoe's structure.

The lifespan varies based on usage, terrain, and care. For dedicated runners, typically 300-500 miles (500-800 km) is a common range before significant performance degradation occurs.

While they offer good cushioning and stability, they are primarily designed for running. For activities requiring lateral support, such as heavy weightlifting or court sports, dedicated training shoes might be more appropriate.

The 'Tokyo' designation typically refers to a specific colorway or design theme. The core performance technology, including the Boost midsole and Primeknit upper, remains consistent with the Ultraboost 21 series.

Primeknit is Adidas's engineered textile that provides a sock-like fit, breathability, and flexibility, adapting to the foot's natural movement.

This is common with Primeknit uppers. Try wearing thinner socks or gently stretching the shoe by hand in the toe box area. If the tightness persists after a few wears, consider if the size is correct or if a different model might be a better fit.

The Boost midsole is designed for longevity, but prolonged heavy use can reduce its effectiveness. Ensure the shoes are clean and that there are no obstructions in the outsole tread. If performance significantly degrades, it may be time to consider replacement.

While the Continental™ Rubber outsole offers excellent grip, performance on extremely wet or slick surfaces can still be challenging. Ensure the outsole is clean of debris. For very slippery conditions, exercise caution.

Minor snags can sometimes be carefully smoothed down. For larger tears, repair may be difficult. Avoid contact with sharp objects. If damaged, it may affect the shoe's fit and support.