100% organic cotton OCS100 certificate issued by Ecocert Greenlife (Wine Heather, Ocean Blue Heather and French Navy Heather: 80% organic cotton / 20% polyester OCS Blended certificate issued by Ecocert Greenlife; Grey Heather: 70% organic cotton / 30% viscose OCS Blended certificate controlled by Ecocert Greenlife). Fitted cut. Ribbed collar and bottom sleeves 1x1. 4-button placket with tone-on-tone buttons. Herringbone band finish on inside collar and side slits. No brand label on collar, only a size chip for easy customization.