Chocolate Molecule Theobromine 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 Tee Chocolate Formula TShit Lightweight, Classic fit, Double-needle sleeve and bottom hem