Solid color: 100% cotton. Ash Heather color: 98% cotton / 2% viscose. Oxford Grey: 90% cotton / 10% viscose. Colors Wine Heather; French Navy Heather; Green Marble Heather; Cloudy Blue Heather: 80% cotton / 20% polyester. And the Grey Heather color: 70% cotton / 30% polyester. All color combinations are made from organic cotton in conversion. Combed cotton. Ribbed round neck with elastane. Neck tape matching in color. Tubular. Double stitching finish at the bottom of the sleeves and the garment.