Nike ReactX Infinity Run 4 - White - UK 5.5

Measure your foot length from heel to the tip of your longest toe. If your measurement falls between two EU sizes, choose the larger one. Refer to the size chart provided for exact foot length to EU size conversions.

The Nike ReactX Infinity Run 4 features a Flyknit upper that offers some flexibility. However, individuals with significantly wide feet might find the fit snug. It's recommended to try them on if possible or consider sizing up.

ReactX foam provides enhanced energy return and superior cushioning, leading to a more responsive and comfortable running experience while reducing the environmental footprint compared to previous foams.

Yes, the excellent cushioning and stability make them suitable for marathon training and racing for neutral runners or those with mild pronation.

Gently wipe them with a damp cloth. Avoid machine washing or using harsh detergents. Allow them to air dry completely away from direct heat.

They are best suited for road running and paved surfaces. They can also handle light trails and treadmill use.

ReactX foam offers a more sustainable production process with a lower environmental impact, increased energy return, and improved cushioning compared to standard React foam.

Ensure you have selected the correct size. If between sizes, consider sizing up. Loosen the laces to create more volume around the foot. For persistent tightness, consider alternative lacing techniques or insoles.

The ReactX foam is designed to break in and offer consistent cushioning. If you experience a significant loss of cushioning, check for any damage to the midsole. Ensure you are not exceeding the recommended mileage for optimal performance.

Check that the laces are tied securely. Ensure the shoe is the correct size and fit for your foot. Clean the outsole of any debris that might be affecting traction. If the issue persists, consider the surface you are running on.