Variable width designs accommodate foot swelling during ultramarathons.

When a trail calls for all-out speed, change into the new Rocket X Trail. With an aggressive, road-racing inspired rocker and H-shaped carbon-fiber plate for dynamic propulsion, this gravel-eater is begging to be set loose. From the pared-back, super-secure upper, to the responsive dual-layer midsole to its lightweight, minimal outsole, this shoe was devised specifically for cruising buff dirt and gravel roads at top speed.

Style - 1176331-BKSK

Variable thickness uppers provide breathability without compromising durability