The On Cloudboom Max delivers marathon-ready cushioning with race-day speed. Built with max cushioning and a responsive ride, the Cloudboom Max helps you stay comfortable and efficient from your first mile to your final push across the finish line. A double layer of Helion™ HF hyper foam absorbs impact and returns energy, while the glass fiber-infused Speedboard® adds snap to every stride. With its ultralight upper, cushioned heel and durable grip, the Cloudboom Max is a true super shoe—engineered to go the distance and help runners of all levels chase their marathon goals. Details Upper: Ultralight, breathable mesh molds to your foot and adapts to movement, while a cushioned heel collar delivers secure comfort over long distances. Midsole: Dual-layer Helion™ HF hyper foam provides soft landings and energetic takeoffs. A glass fiber–infused Speedboard® supports efficiency and propels you forward. Outsole: Strategically placed rubber ensures grip and durability on the road without adding bulk.