Women's On Cloudboom Running Shoe

Women's On Cloudboom Running Shoe


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Item No. 37.99639
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The lightweight, carbon-fiber-infused shoe 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, we created 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. We worked with athletes to Swiss-engineer the ultimate shoe for marathons and road races. It’s ultralight, but powerful. It’s agile enough to handle sharp turns, but without compromise to cushioning. It’s everything you need for your fastest marathon ever. This is the sound of unstoppable. Boom.

Best For:

  • Surface: Road, Gyms, Flats
  • Category: Road Racing – Very lightweight, and offering more cushioning than track and cross country racers, road racing shoes are designed for events ranging from a road mile all the way to the marathon.

Benefits Include:

    Powered by Carbon
  • Optimized for Agility
  • The Sound of Unstoppable
  • Fits true to size.


  • Weight: 6.53oz
  • Heel-to-Toe Offset: 9mm
  • Cushion Level: Moderate Cushion
  • Pronation Support Level: Neutral
  • Style: 37.99639