Nike ReactX Infinity Run 4 - White - UK 7.5

ReactX foam offers a significant improvement in energy return and is produced with at least 43% lower carbon footprint compared to previous Nike running shoes, making it a more sustainable choice.

Yes, the advanced cushioning and support of the ReactX Infinity Run 4 make them well-suited for marathon training and racing, providing comfort and energy return over long distances.

You should have about a thumb's width of space between your longest toe and the end of the shoe. The shoe should feel snug but not tight, with no pinching or excessive pressure points.

While they offer good cushioning, the design is optimized for running. For cross-training or weightlifting, shoes with more lateral stability and a flatter sole might be more appropriate.

The lifespan varies depending on usage, terrain, and runner's weight, but typically, running shoes are recommended to be replaced every 300-500 miles (480-800 km) to ensure optimal performance and injury prevention.

The Flyknit upper is designed for breathability and is not waterproof. It will offer some resistance to light moisture but is not suitable for running in heavy rain or wet conditions.

Try adjusting the lacing system, ensuring it's not over-tightened. Consider wearing thicker socks or if the issue persists after a short break-in period, ensure you have the correct size.

Ensure the shoes are clean and that the midsole has not been compressed by excessive heat or improper storage. While durable, all cushioning will naturally break down with very high mileage.

The rubber outsole provides good traction, but like all running shoes, performance on extremely wet or slick surfaces may be reduced. Exercise caution in such conditions.