The Rundown A propulsive ride for pure speed. The Cielo X1 2.0 is a propulsive ride designed for those seeking pure speed. Engineered as a tip-of-the-spear product for higher tempo pickups, it’s a must-have for speed seekers. The shoe features an aggressive forefoot rocker and an ultra-responsive dual-density PEBA midsole, paired with a snappy carbon fiber plate for maximum pace. The lightweight, breathable upper is designed with dynamic cutouts to reduce weight, while the cushioned collar ensures a secure foot lockdown. To enhance traction and performance, the Cielo X1 2.0 is finished with a sticky rubber outsole, ideal for those chasing personal records.