Official CONTAMINATION Branded 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 Official T.W. Piperbrook T-Shirt Official CONTAMINATION T-Shirt Lightweight, Classic fit, Double-needle sleeve and bottom hem