Bird Nerd T-Shirt - Bird Watching Birding Gift 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 Bird Nerd T-Shirt - Bird Watching Birding Gift, Birding Shirt Bird Watching Shirt. Funny birdwatching gift shirt for bird nerds, bird geeks, birding geeks and ornithology enthusiasts. Lightweight, Classic fit, Double-needle sleeve and bottom hem