To promote its new line of trail-running gear, which is scheduled to hit the stores this spring, Mammut has signed sponsoring contracts with four top mountain marathon athletes, Helen Bonsor, Ildikò Wermescher, Csaba Németh and Beni Hug. Additionally, the Swiss brand will act as main sponsor of the second edition of the Swiss Irontrail, which will be held in the canton of Graubünden from Aug. 9-11.