Your second core layer is crucial and the Fila Core Half Zip Jacket will provide the coverage you need. This jacket features half zip entry, inner neck taping for added comfort, ultra lightweight coverage, contrast mesh insets at sides, mesh inset at upper back to keep you cool, front pockets, UV protection and a metallic heat transfer F box logo at back neck. The fabric has wicking properties to take moisture away from your skin and to keep you drier. Material: Polyester, Spandex.