Kids 6th Birthday T-Shirt. Boys 6th Birthday Kids Party Hero Tee 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 Kids Party 6th birthday gift. Perfect T-Shirt to celebrate a little Hero's birthday! A fantastic birthday themed T-Shirt which comes in 5 colors. Lightweight, Classic fit, Double-needle sleeve and bottom hem