The double knit fabric is soft, stretchy and warm for excellent comfort and mobility. The front panel made of elastic fabric stretches like a knit fabric while providing wind resistance. The material wicks away sweat and dries very quickly. 4-Way Stretch technology allows free movement in every direction. Secure zippered pocket on the left arm. Built-in thumb holes help keep the sleeves in place, extended sleeves replacing gloves help trap even more heat. Reflective elements for running in low light. The slightly shortened length reaches the waist.