The On Women's Cloudboom Running Shoes are a lightweight, carbon-fiber-infused pair engineered for fast marathons and road races. The Cloudboom features a new carbon-fiber infused Speedboard™ for serious explosivity and speed. And for the first time ever, there is a twin layer of CloudTec® in Helion superfoam. One above the Speedboard™ and one below, delivering a unique, adaptive fit underfoot. A single layer of ultralight engineered mesh keeps weight and temperature down. Reinforced sections at the forefoot add the stability needed to handle sharp turns on asphalt. Team this with a new traction pattern on the sole and you're ready to crush city courses, even in wet conditions. They are ultralight, but powerful, agile enough to handle sharp turns without compromise to cushioning. The On Women's Cloudboom Running Shoes are everything you need for your fastest marathon ever.