On Running Cloudultra Trainers have double the Helion superfoam for greater comfort. Furthermore, two layers of Clouds technology work in tandem to provide maximum cushioning and comfort. These shoes are perfect for long-distance running. The double-layered mesh upper is tough and breathable. Together with the perforated wraparound construction, you can obtain superior temperature control. These shoes include Connected Clouds, a technology that keeps stones out of the shoe.