On Running Merino Ultra Sock

On Running's first dedicated trail running sock with a high-tech ergonomic construction – for max comfort and protection.

• Made from merino wool and recycled nylon
• Open mesh channels for ventilation
• Anti-slip underfoot tech
• Support on arch and upper heel
• Reflective yarn on cuff
• Ergonomic toe construction
• Zonal terry cushioning
• Merino wool helps regulate heat