adidas Ultra Boost 21 Trainers - Blue - UK 9

The Primeknit upper offers some adaptability, but the overall fit tends to be true to size or slightly snug. If you have significantly wide feet, it's advisable to try them on or consider a half-size up.

The Ultra Boost 21 typically features an updated midsole construction for enhanced Boost content and energy return, a refined Primeknit upper, and often an updated heel counter for improved stability.

While the description provides the main colors (Blue and Core Black), monitor calibration can affect perceived color. It's best to view images on multiple devices if possible or consult reviews for color accuracy.

Warranty information typically depends on the retailer. Brand & Trust Drop Zone, as a trusted retailer, would adhere to standard manufacturer warranties for defects. Please check their specific return and warranty policy.

It is generally not recommended to machine wash Boost trainers as it can damage the adhesives and materials. Hand washing with mild soap and cold water is the preferred method.

No, the Primeknit upper is breathable and water-resistant to a degree, but not fully waterproof. They are not designed for use in heavy rain or wet conditions without additional waterproofing measures.

Loosen the laces and adjust the fit. If the issue persists, consider if a half-size larger might be more appropriate, especially if you have wide feet.

While Boost cushioning is durable, its responsiveness can diminish after extensive mileage. Ensure the shoes are clean and dry, as dirt can sometimes affect feel.

Clean the outsole with water to remove any debris or mud that may be clogging the tread pattern. The Continental™ rubber is designed for grip, but debris can impede this.