Iowa + Tyrannosaurus = Iowasaurus. 2T & 4T sizes are a Green Screen Print on a White T-shirt (100% Combed Ringspun Cotton) while 5T (YXS) and above are on a White T-shirt (60% Combed Ringspun Cotton / 40% Polyester) Cut and sewn sweatshop free. Designed and printed by Union Labor at RAYGUN.