Nike ReactX Infinity Run 4 - Grey - Pink - UK 5.5

Measure your foot length from the heel's most prominent point to the tip of your longest toe. If your measurement falls between two sizes, choose the larger one. Allow for a potential 0.5 cm error, which is considered normal due to individual foot shapes.

ReactX foam provides enhanced cushioning and increased energy return, leading to a more responsive and comfortable ride, while also being more sustainable than previous Nike foams.

Yes, the enhanced cushioning and stability make them well-suited for the demands of marathon training and racing.

While they offer good cushioning, their primary design is for running. For specific gym activities like weightlifting, shoes with a flatter, more stable base might be more appropriate.

The shoe should feel snug but not tight. There should be a thumb's width of space between your longest toe and the end of the shoe when standing. Ensure no part of your foot is bulging over the sole.

The product information is based on European (EU) sizing. Refer to the provided size chart, which lists corresponding foot lengths in centimeters (cm) to help you find the correct EU size, and then convert to your local size if needed.

Please refer to the retailer's specific warranty policy for information regarding the warranty period and coverage for Nike products.

Verify your foot length against the provided size chart. If between sizes, opt for the larger size. Allow for a slight break-in period as the shoe adapts to your foot.

Ensure you have followed the sizing guide accurately. Try wearing them with different types of running socks. Gradually increase wear time to allow your feet to adjust to the shoe's support and cushioning.

The outsole is designed for general traction; performance on extremely wet or slippery surfaces may vary. Ensure the outsole is clean of debris. For highly variable conditions, consider specialized trail running shoes.