Neoteric™ textured fabric with inherent wickability. UPF 30+ UV protection. Self fabric bound neckline and armholes. Twin needle curved drop hem. Tear out label. 100% polyester. NOTE mens vest is NOT a racer back style as shown here and is normal mens running vest syle. Weight: 140 gsm s to fit chest 37/39 m to fit check 39/41 l to fit chest 41/43 xl to fit chest 43/45 xxl to fit chest 45/48