Kids 4th Birthday T-Shirt. Boys 4 year Birthday Spaceship Alien 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 4th birthday gift. Perfect T-Shirt to celebrate a little Spaceman's birthday! A fantastic Spaceship birthday themed T-Shirt which comes in 5 colors. A great retro spaceship boys birthday shirt design. Lightweight, Classic fit, Double-needle sleeve and bottom hem