It's A Mark Thing You Wouldn't Understand 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 birthday gifts for him, birthday gifts for men, birthday gifts for boys, birthday gifts for dad, birthday gifts for papa It's A Mark Thing You Wouldn't Understand T-Shirt Lightweight, Classic fit, Double-needle sleeve and bottom hem