Kids 6th Birthday T-Shirt. Boys 6 year Birthday Lightning 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 action birthday themed T-Shirt which comes in 5 colors. Lightning bolts design - ideal for someone who is always in the center of the action! Lightweight, Classic fit, Double-needle sleeve and bottom hem