Nike React Infinity Run Flyknit 3 - White - UK 11

Measure your foot length from the back of your heel to the tip of your longest toe. If your measurement falls between two standard sizes, it is generally recommended to choose the larger size for optimal comfort.

Yes, the Nike React Infinity Run Flyknit 3 is designed with ample cushioning and support, making it a suitable choice for marathon training and long-distance running.

While primarily designed for running, the stable platform and cushioning can make them acceptable for some gym activities. However, for specific training like weightlifting, shoes with a more rigid sole might be preferable.

Most runners replace their shoes every 300-500 miles. This can vary based on your running style, weight, and the surfaces you run on. Look for signs of wear like compressed cushioning or worn-out tread.

The Flyknit upper is engineered for breathability and is not waterproof. It will dry relatively quickly if it gets wet from rain or puddles, but it does not offer protection against significant water exposure.

The React Infinity Run Flyknit 3 typically features updates to the foam compound for improved responsiveness, refinements to the upper for better fit and breathability, and minor adjustments to the geometry for enhanced stability compared to earlier iterations.

Ensure you have selected the correct size. If between sizes, opt for the larger one. Allow for a short break-in period as the Flyknit material can adapt to your foot shape.

The React foam is designed for durability, but cushioning can naturally decrease over many miles. Consider replacing the shoes after approximately 300-500 miles of use, depending on wear patterns and personal preference.

Check that the laces are tied securely using a runner's knot or double knot. Ensure the shoe size is correct and your foot is not sliding within the shoe.