Our C-FREE ® carbon neutral polos not only feel good, they do good. With C-FREE, we measured the carbon footprint of these styles and we're neutralizing their impact with Carbonfree ® certification. 4.9-ounce, 100% recycled polyester jersey Snag-proof Moisture-wicking Self-fabric collar 3-button placket Grey buttons include 31% recycled content Dyed-to-match white buttons on White include 31% recycled content Side vents Due to the nature of polyester performance fabrics, special care must be taken throughout the printing process.