The Women's Carbon X2 from Hoka is an endurance racer. While that's absolutely true, the incredible underfoot feel also allows it to be used as a everyday training shoe for those looking for the best. The Carbon X2 combines a few main features: a carbon fiber plate, aggressive Rocker shape as well as a perfect combination of soft and responsive foam. The result is an incredibly smooth, fast shoe. So smooth that you can barely hear someone running next to you!