On Running Cloudboom Max is a marathon-focused road running shoe that prioritizes speed and long-distance comfort, built around CloudTec® cushioning and dual Helion™ HF foam for enhanced energy return. Key attributes: Multicolor | White Juniper | Polyester | CloudTec® cushioning system for speed | Dual Helion™ HF foam layers for energy return | Fiberglass Speedboard® for stability and efficiency | Rubber outsole for road grip | Lightweight and breathable construction | Padded heel for long-distance comfort | Supportive upper that adapts to foot movement | Fiberglass-enhanced Speedboard® for stable propulsion | Low-top silhouette | Streamlined, race-oriented geometry | Breathable mesh upper | Composition & care: Upper: Polyester mesh | Midsole: Dual Helion™ HF foam | Speedboard: PA11 (polyamide) with 8% glass fibre | Outsole: Rubber | Other components: TPU | Do not machine wash. Remove insoles and laces and hand wash with warm water as needed. Air dry away from direct heat.