Theobromine Molecule Chocolate 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 C7H8N4O2 Alkaloid in Chocolate 3,7-dimethyl-1H-purine-2,6-dione Lightweight, Classic fit, Double-needle sleeve and bottom hem