The Colby band collar polois knit from our proprietary thirty-singles Pimaformance jersey, which is knit from a blend of Peruvian Pima Cotton + Elastane yarns. Our ELS (extra-long staple) cotton, the smoothest in the world, is also the purist of cellulose fibers, and like all cellulose fibers, are biodegradable. This product reduces the impact on landfills everywhere at the end of its life-cycle. 95.5% ELS Pima Cotton / 5.5% Elastane Athletic Fit with Off Shoulder Seam Ribbed ‘Rad-Band’ collar Bias cut Underarm w/ ‘ERM’ (Extended Range of Motion) Dead Center heat transfer applique (Back right shoulder)3 Button hidden placket Natural shell buttons (extra button included Slit side seams Recycled HD-Damask and Satin labels UPF 50+