Features of the Pearl Izumi Men's Pro Merino Thermal Jersey Thermal merino wool/nylon fabric for comfort, odor control and natural body temperature management Hand-stitched design lines on chest panel for added visual interest Full length vislon zipper for ventilation and ease of use Three back pockets plus additional single zippered back pocket for securing valuables Bioviz reflective elements for low-light visibility Fabric Details Merino Wool/Nylon