Design Philosophy Tough, featherweight weather protection that can be worn on or off the bike and packs smaller than a can of Irn Bru- the SingleTrack Durajak ticks all the boxes. Cordura is not new to the Endura range but in this revolutionary lightweight jacket it’s set to be a significant game changer. Cordura Fabric The Singletrack Durajak uses Cordura fabric which offers rugged durability and lightweight strength, making the jacket resistant to abrasions, tears and scuffs.