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