Funny Youngest Child Rules Don't Apply To Me Tshirt Siblings 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 Ideal T-shirt for the younger siblings, younger brothers, younger sisters, baby brothers and baby sisters, the babies of the family. Also check out our shirts for middle and older siblings. Fun Novelty Gift Tee for Birthdays, House warming,Family get togethers, Christmas, Special Occasions. Lightweight, Classic fit, Double-needle sleeve and bottom hem