Engineered with a Cloud Tec® cushioning system, these sneakers provide a highly responsive ride, while the Helion™ HF hyper foam ensures maximum energy return. Cloud Tec® cushioning system for responsive runs Helion™ HF hyper foam for max energy return bottom layer of helion™ foam for durability no plate for reduced impact strong, durable and breathable upper re-engineered heel construction for multi-hour comfort enhanced rocker shape for energetic push-offs neutral support