Breathable mesh Uniquely engineered mesh places breathability and support exactly where they’re needed on your foot. Knitted from one single layer to enhance the fit. In-shoe comfort Second-layer sock construction brings ultimate in-shoe comfort. It adapts to your foot for a unique fit. Traction and lightness Newly developed arrow pattern provides outstanding grip and traction. The open Cloud construction saves weight to make the Cloudsurfer lighter than ever. Visibility and comfort Reflective heel strap allows for improved nighttime visibility along with providing additional heel support.