Get ready to run powerfully uphill and downhill in the redesigned X ULTRA™ 4 GORE-TEX. It's as agile as a trail running shoe, but offers the stability, grip and waterproof protection you need for technical terrain. With a new chassis, the shoe now protects the sensitive ankle area even better without restricting freedom of movement. Trail running inspired agility Our trail running expertise comes to the fore in this shoe, which is lighter and more manoeuvrable to keep you light on your feet on uneven terrain. Optimised stability The new ADV-C chassis optimally stabilises the outer ankle area without restricting your mobility. Grip on any terrain The Contagrip® MA outsole clings to wet or slippery surfaces, which is especially helpful when running downhill.