New Balance FuelCell SuperComp Pacerv2 - Green/White - UK 10

Yes, the New Balance FuelCell SuperComp Pacer v2 is designed for road racing and can be an excellent choice for marathon distances due to its lightweight and responsive characteristics.

While they can be used for some training, they are optimized for speed and racing. For high-mileage daily training, a shoe with more cushioning and durability might be more appropriate to prolong the life of these specialized trainers.

FuelCell is New Balance's proprietary performance foam technology, designed to provide a highly responsive and energetic ride, offering a propulsive feel with each step.

The shoe should feel snug but not constricting. There should be about a thumb's width of space between your longest toe and the end of the shoe when standing. Your heel should feel secure without slipping.

For optimal performance in racing shoes, it's generally recommended to replace them after approximately 200-300 miles (320-480 km) of use, as the responsiveness and cushioning can degrade over time.

No, these trainers are designed with breathable materials for ventilation during intense activity and are not waterproof.

Loosen the laces and re-tie them, ensuring a snug but not overly tight fit. If the issue persists across all lacing options, consider if the size is appropriate or if the shoe's width is not suitable.

Adjust lacing using a 'heel lock' or 'runner's knot' to secure the heel. Ensure you are wearing appropriate running socks. If the problem continues, the shoe might not be the right fit for your foot shape.

Ensure the shoes are clean and free from debris that might impede cushioning. For racing shoes, responsiveness naturally decreases with significant mileage. Consider replacing them after 200-300 miles for optimal performance.