Ultra lightweight open structured mesh base layer with short sleeves. Composition: 93% polyester, 7% elasthane. Made of a technical ultralight and open mesh, which is specifically developed and engineered to keep you cool and dry thanks to reduced contact area. The open mesh structure promotes airflow between the fabric and the skin while the push-pull effect sucks sweat away from your skin to the outer layer. Flat stitched seams for extra comfort.