8.3 oz/ly (CA), 5 oz/sq yd (US), 169 gsm (EU). 100% performance polyester hybrid mesh. Rib knit collar. Panel at shoulders and sides. Moisture wicking. Snag resistant. Breathable. Tagless. Classic fit. Due to the nature of polyester, special care must be taken throughout the decoration process. Please refer to product size spec PDF file for more details.