The On Cloudflow 4 is snappy, quick and nimble for all of your workouts. When you lace up the Cloudflow 4, you know it’s go time. This shoe is super lightweight so that nothing weighs you down. Whether you’re doing speedwork or just want a sleek shoe to wear around town, the On Cloudflow 4 will keep up with your fast-paced lifestyle. Details Upper: The 100% recycled polyester engineered woven upper is incredibly lightweight and breathable. It hugs your foot for sock-like comfort. Midsole: The dual-density Helion™ Superfoam is combined with a spoon-shaped nylon blend Speedboard® for a fast and responsive rolling sensation. Outsole: The grip rubber pads on the bottom of each Cloud pod give you traction and durability for road running in wet and dry conditions. It includes On’s signature CloudTec® technology, where each individual pod compresses horizontally and vertically to give you cushion just where it should and provide explosive take-offs.