The Ultra Run series feature cushioned terry throughout the entire foot, including the toes, to help soften the impact feet sustain during a run or workout. Linear knit lines on the underside of the foot offer additional arch support and a tighter fit to help eliminate friction. Light compression throughout the sock plus strategically placed mesh throughout the foot and leg offer extra ventilation and breathability. The Ultra Run Crew features a ribbed knit, while the Women’s Ultra Run Crew features mesh waves to keep the legs cool.