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Featuring 2XU's revolutionary ICE X Polyester with Xylitol and IR blocking technology to inhibit heat penetration, the impressive 2XU TECH Speed X Run Top is anatomically engineered to achieve the ultimate in moisture management. With ICE X fabric with Xylitol and IR/UV blocking, heat is deflected from the body to lower skin temperature by up to 5.4 degrees F. Add in flatlock stitching, Raglan sleeve design, and you have a dry, cool, chafe free garment that will keep you comfortable training or racing.