Hammer 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 Funny Quotes Sayings. Hammer in the yellow circle. Hammer Tee Shirt great for adults and kids Lightweight, Classic fit, Double-needle sleeve and bottom hem