6.3 oz/ly (CA), 3.8 oz/sq yd (US), 128 gsm (EU). 100% performance polyester jersey with wicking technology. Side seamed. Mitered V-neck pattern. Contoured fit. Breathable. Tagless. Classic fit. Due to the nature of polyester performance fabrics, special care must be taken throughout the decoration process. Please refer to product size spec PDF file for more details.