2-pair set - Run Ultra Race black/yellow Running socks - Run Ultra Race black/yellow (Size Socks):40-41 With a flex rating of

With a flex rating of 90 and a width of 104 mm

The polyamide fibres provide an excellent fit and foot support during exercise

The Sidas Run 3D Protect insoles and their heel gel provide exceptional cushioning

The nylon heel cup combines support and flexibility to accommodate the golfer’s movements

Find out more about 3Feet® technology

2-pair set - Run Ultra Race black/yellow Running socks - Run Ultra Race black/yellow (Size Socks):40-41 With a flex rating of"Relying on champions to co create tomorrow's foot comfort solutions that are even more efficient and innovative." That's the challenge of offering you the best in running socks! That's why the Run Ultra running sock was developed with both our expertise in the foot domain, and the field feedback from our athletes and the Sidas Matryx Team. The sock acts like an exoskeleton around your foot to stabilise it, provide support and compensate for muscle