- Ultra-light melange knit construction with Icefil uses Xylitol to keep you cool and comfortable - Icefil – Icefil technology is a multifunctional, intelligent moisture sensitive fabric designed to keep you cool when your body temperature is not. Icefil is a must have if you plan to train or race anywhere around the globe that is hot and humid. - Xylitol Yarn – Convert your sweat into refrigerant. Stay cool and fresh. Xylitol yarn reacts to your body’s moisture, creating an additional 1.8 degree F reduction in skin temperature. This technology is especially effective in high humidity. - Mesh back panel for enhanced ventilation and cooling - Flatlock stitch construction ensures next-to-skin comfort and minimizes chafing - Reflective Details - UPF 50