Chicago Flag Heart 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 Vintage I Heart Chicago Flag Windy City T Shirts.Chi Town tees available in many sizes and colors. Popular retro travel Illinois Chi City shirts by Tee Styley. Lightweight, Classic fit, Double-needle sleeve and bottom hem