Made with 100% cotton interlock, which is extremely soft, firm and absorbent. Mercerization treatment gives this fabric a silk-like lustrous appearance for a polished look and hand feel, adding strength and reducing shrinkage. PERFORMANCE FABRIC: We also added special anti-odor and breathability properties to keep it feeling fresh and comfortable. Polo collar with button placket. Short sleeves. Straight hem with vented sides. Made exclusively for Banana Republic Factory. Sits close to the body and is expertly designed for trimness through the chest, arms and waist.