Plain colors 100% cotton. Ash Heather colors: 98% cotton / 2% viscose. Oxford Gray color: 90% cotton / 10% viscose. Combed cotton with enzyme wash. Fitted cut. Reinforcing tape at the neckline (White for the White colour, Dark Gray for the Oxford Gray color and Oxford Gray for all the other colours). Double-needle finish at bottom of sleeve and bottom of garment. Certified STANDARD 100 by OEKO-TEX®N° CQ1007/7, IFTH.