BROOKS BROTHERS XXL DOUBLE MERCERIZED 100% COTTON PERFORMANCE KNIT SS POLO SHIRT Double mercerized cotton is a fabric that has been treated twice through the mercerization process. The process involves treating cotton fabric in a caustic solution under tension, which causes the fibers to swell. Double mercerized cotton is softer, smoother, and stronger than regular cotton. It also has a brighter color, better resistance to multiple washings, and less lint. Mercerized cotton is often used for making summer garments and accessories because it's lightweight and has a beautiful sheen. It's also perfect for machine quilting and piecing. THE BRONZE HUE WITH A BRILLIANT SHEEN IS ABSOLUTELY A HEAD TURNER. BROOKS BROTHERS QUALITY WITH A SUPERIOR PROCESS TO TREAT THE COTTON FOR INCREDIBLE PERFORMANCE ( HENCE THE NAME) THREE BUTTON PLACKET WITH RIBBED COLLAR AND SLEEVE CUFFS PHENOMENAL ADDITION TO ANY GENTLEMEN’S CLOSET ROTATION.