Nike Spark Flyknit - Burgundy Crush - Trainers - UK 4

While they offer good cushioning for everyday wear and light activities, they are primarily designed as trainers for daily use and may not provide the specialized support required for intense running or marathon training.

Your toes should not touch the front of the shoe, and there should be about a thumb's width of space between your longest toe and the end of the shoe. The heel should not slip excessively.

The breathable Flyknit upper offers limited water resistance. They are best suited for dry conditions. For wet weather, consider waterproof footwear.

The upper is constructed with Nike's Flyknit material, known for its breathability, flexibility, and lightweight support.

Remove the laces and hand wash them with mild soap and water. Allow them to air dry completely before re-inserting.

Nike typically offers a limited warranty against manufacturing defects. Please refer to the official Nike website or your proof of purchase for specific warranty details.

This can sometimes occur due to moisture trapped between layers. Try to dry the shoes thoroughly. Inserting a dryer sheet inside can also help absorb moisture and reduce noise.

The cushioning may naturally compress with extended use. Ensure the shoes are clean and dry. For significant degradation, consider replacing the shoes if they are heavily worn.

Ensure you have the correct size and width. Wear appropriate socks. If the issue persists, the fit might not be suitable for your foot type.