Bird Nerd 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 Birding shirt for bird watchers and bird lovers. Bird nerd shirt for for men, women, kids, teens, boys, and girls! Bird Watching Birding Gift for Bird Wacther. Bird nerd tshirt, bird watchers t-shirt, bird watcher shirts, gift idea for bird wacther Lightweight, Classic fit, Double-needle sleeve and bottom hem