The XR is for higher mileage runners who transition between trail and pavement and want a neutral shoe. Perfect fit comes from Salomon's Sensiflex, soft reinforcement on the ball of the foot, and the Sensifit system to wrap around the upper instep precisely. An Oversized Tendon midsole component provides a smooth cushioned ride with energy return for long runs. And a new chevron pattern Contagrip outsole ensures precise grip on virtually any surface. The neutral version has a 3 piece midsole with a symmetrical shape, and fully welded sensifit upper.