The latest iteration of On’s Cloudswift sneaker comes with a major performance upgrade. With an updated knit upper, premium CloudTec® technology and sustainably-made Speedboard®, the Cloudswift 4 offers supreme comfort and breathability without compromising a sleek style. Details Upper: Made from recycled polyester, this single piece of flat-knit engineered mesh allows maximum airflow. The perforated toe box boosts the shoe’s breathability. A pull-on tab at the heel and standard shoe lacing make securing the Cloudswift 4 a breeze. Midsole: With CloudTec® technology, the midsole of the Cloudswift 4 features Helion™ superfoam on top of a layer of denser foam. The new Helion™ superfoam provides a cushioned yet energetic ride, while the denser base foam allows for a more propulsive push-off. Extra support and responsiveness come from the sustainably made, nylon-blended Speedboard®. Outsole: The classic rubber outsole gives the Cloudswift 4 ideal traction for road running on city streets.