Microbiology Is Just Like Cooking, Just Don't Lick the Spoon 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 This funny science T-shirt would make the perfect gift for a microbiologist, biology major, biology teacher, or anyone interested in virology, microorganisms etc. Lightweight, Classic fit, Double-needle sleeve and bottom hem