SINGLE SIZINGThis vest is available in single sizes to allow workers to order their exact size for a more tailored, performance-style fit compared to dual-size vests (*tip: for best single-size fit, select one size down from your normal T-shirt size).3oz polyester mesh. This hi-vis vest features 2 reflective tape set on a 3.5 contrasting mesh background and reflective piping for enhanced low-light visibility.