adidas Ultraboost 21 Trainers - White/Black - UK 9

The Primeknit upper offers an adaptive fit, but it is generally considered a snug fit. For individuals with very wide feet, it is recommended to try them on first or consider a half-size larger if available.

The Boost midsole can be cleaned using a damp cloth and a small amount of mild soap. A soft brush can also be used to remove dirt. Avoid abrasive cleaners or machine washing.

The Ultraboost 21 features an enhanced Boost midsole with more energy return, an updated Continental Rubber outsole for improved grip, and a refined Primeknit upper for a more adaptive and supportive fit compared to earlier versions.

While primarily designed for running, the Ultraboost 21 offers good stability and cushioning suitable for some gym activities. However, for dedicated weightlifting or lateral movements, a shoe with more specific support might be preferable.

The Continental Rubber outsole is known for its exceptional durability and traction, offering excellent longevity even with regular use on varied surfaces.

The 'Oreo' colorway refers to the black and white speckled design of the trainers, resembling the popular cookie.

Wear with thin athletic socks or try loosening the laces significantly. If the issue persists, consider trying a half-size up or a different model with a less adaptive upper.

While Boost technology is durable, extensive use can slightly diminish its responsiveness. Ensure the shoes are clean and free of debris that might impede performance. For significant loss, it may be time to consider replacement.

The Continental Rubber outsole provides excellent grip, but extreme conditions can still pose challenges. Ensure the outsole is clean of mud or debris. For exceptionally slippery conditions, extra caution is advised.