Arnold Chiari Malformation Shirt Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Arnold Chiari Malformation Shirt, Arnold Chiari Malformation Arnold Chiari Malformation, cms medicare, Lightweight, Classic fit, Double-needle sleeve and bottom hem