Trail running technology that brings some serious swift keeping adventure racers centered and efficient to maintain speed over changeable terrain. Proprietary TrailSpring design positions visible tubes bisected by support beams in a full-length TPU plate to inhibit overpronation and cushion heel-strike. Trail Balanced last with integrated arch bridge stabilizes the heel while freeing the forefoot for easy toe off. Both quick-cinch airmesh upper and Merrell Air Cushion sole (with Q-Form stride alignment for women) drain readily and are gaiter-compatible. Vibram Full Speed II sole features heel-centering cutaway design and flex grooves for propulsion at the forefoot.