Colorado T-Shirt The Centennial State 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 Vintage Colorado The Centennial State T Shirt Travel Denver,Fort Collins,Thornton,Boulder,Arvada,Aspen,Loveland,Lakewood,Westminster shirts from Tee Styley. Lightweight, Classic fit, Double-needle sleeve and bottom hem