Kids 7th Birthday Number Shirt. Girls 7 year Rainbow 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 Girls Party 7th birthday gift. Perfect T-Shirt for a special girl to celebrate their birthday! A fantastic girls birthday themed T-Shirt which comes in 5 colors. Lightweight, Classic fit, Double-needle sleeve and bottom hem