World's Greatest Sister T-shirt for girls Little Big Sister 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 World's Greatest Sister T-shirt for girls Little Big Sister Perfect as a gift for holidays such as a birthday, Christmas, Valentine's day, New Year's, Easter or Halloween costume. Lightweight, Classic fit, Double-needle sleeve and bottom hem