Humongous Entertainment: Pajama Sam Backgrounds T-Shirt 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 Official Humongous Entertainment T-Shirt Visit Amazon's Humongous Entertainment Page to see our highlighted merchandise: amazon.com/humongousentertainment Lightweight, Classic fit, Double-needle sleeve and bottom hem