Osteogenesis Imperfecta Awareness T 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 Osteogenesis Imperfecta - Osteogenesis Imperfecta Shirts - Osteogenesis Imperfecta Awareness Shirt Osteogenesis Imperfecta Awareness Lightweight, Classic fit, Double-needle sleeve and bottom hem