If a revolution to combat concussions is going to happen in sports, it’s the athletes that must leading the way. Ali Krieger knows it. The U.S. women’s national team’s dynamic right back has returned to action this week after suffering a brain-rattling concussion three weeks ago in the Washington Spirit’s National Women’s Soccer League (NWSL) season opener, but she comes equipped. For the World Cup tune-up game this Sunday against the Republic of Ireland, Krieger, 30, is going to be wearing a headband from Unequal, a company that makes protective sports gear.