Shop all AC Runner colorsThe New Balance AC Runner is a sport-training runner for athletes who need reliable performance footwear for conditioning runs, drills, and cross-training — as well as everyday wear. At its core is a Fresh Foam X midsole engineered with three distinct levels of foam firmness, delivering cushioning suitable for different movement types, from explosive lateral cuts to steady-pace runs. Firm durometer foam rails in the midsole add stability for both linear and side-to-side motion. A sculpted midsole and breathable mesh upper with printed graphics make a statement on and off the field.