adidas UltraBoost 21 'Tokyo' - UK 10

The 'Tokyo' edition features a unique colorway and design inspired by the city of Tokyo, offering a distinct aesthetic while maintaining the core performance features of the UltraBoost 21.

The UltraBoost 21 features 6% more Boost capsules in the full-length midsole compared to previous models, leading to even greater energy return and a more responsive ride.

Yes, the Primeknit upper is engineered for durability and flexibility, providing a comfortable and secure fit while being made from recycled materials.

The UltraBoost 21 is optimized for road running. While it can handle light trails, its outsole grip and construction are best suited for pavement and firmer surfaces.

Refer to the adidas sizing chart and consider that the UltraBoost 21 has a snug, performance-oriented fit. If you are between sizes or prefer a roomier fit, you might consider sizing up.

Warranty information typically varies by region and retailer. Please check the warranty details provided at the point of purchase or on the official adidas website for specific terms.

The Primeknit upper is designed to be snug for support. Try wearing thinner socks or wearing the shoes for shorter periods initially to allow them to break in. Ensure you have selected the correct size.

Boost foam is durable, but performance may slightly decrease after extensive use. Ensure the shoes are clean and free from debris which might affect the feel. Consider replacing after significant mileage (typically 300-500 miles).

While the outsole provides good grip, excessive wetness can reduce traction. Clean the outsole regularly to remove any debris. For very wet conditions, exercise caution.