adidas UltraBoost 21 'Tokyo' - UK 10.5

The 'Tokyo' edition often features specific colorways and design elements inspired by the city of Tokyo, while retaining the core UltraBoost performance technology like the Boost midsole and Primeknit upper.

Yes, while designed for running, the comfort and cushioning of the UltraBoost 21 make them suitable for casual wear and walking.

A proper fit means there should be about a thumb's width of space between your longest toe and the end of the shoe. The heel should feel secure without slipping, and the midfoot should feel comfortably snug.

The Primeknit upper offers some protection against light moisture, but it is not fully waterproof. They can be worn in light rain, but prolonged exposure to heavy rain or puddles may result in wet feet.

The 6% increase in Boost capsules provides even greater energy return and cushioning, leading to a more responsive and comfortable ride, especially over longer distances.

Yes, the Primeknit upper is designed to be both comfortable and durable for running. It's made from recycled materials, adding to its modern appeal.

The Primeknit upper offers a snug fit. Try wearing thinner or thicker socks, or consider trying a half-size up or down to find the optimal fit for your foot shape.

Ensure the midsole is clean and free from debris. While Boost foam is durable, prolonged exposure to extreme temperatures can affect performance. Regular cleaning as per care instructions can help maintain responsiveness.

Verify that the lacing is appropriate – not too tight, not too loose. Ensure the shoe is the correct size for your foot. If discomfort persists, it may be beneficial to consult with a running specialist to assess your gait and footwear needs.