Mastocytosis Awareness Shirt - I Wear Blue For My Hero 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 Mastocytosis Awareness Shirt - I Wear Blue For My Hero, Mastocytosis Mastocytosis Shirt, Mastocytosis Awareness, Mastocytosis Lightweight, Classic fit, Double-needle sleeve and bottom hem