Capsaicin Molecule Spicy 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 Spicy molecule in chile / chili peppers (E)-N-[(4-Hydroxy-3-methoxyphenyl)methyl]-8-methylnon-6-enamide C18H27NO3 Lightweight, Classic fit, Double-needle sleeve and bottom hem