This Is What 100 Days Smarter Looks Like Shirt Day of School 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 100 Day of school Tshirt Cocomo Tees 100 Days of school shirt Lightweight, Classic fit, Double-needle sleeve and bottom hem