Funny Pterodactyl T-Shirt | Don't Ptread On Me Dinosaur 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 Pterodactyl T-Shirt - A funny dinosaur shirt with "Don't Ptread On Me" design - a parody of "Don't Tread On Me" Shirts. Perfect for Libertarian dinosaur lovers! Available in men's, women's, youth and kids sizes, this graphic tee shirt makes a great gift. Official Yipptee T-Shirt with Funny Pterodactyl Design Dinosaur Print Lightweight, Classic fit, Double-needle sleeve and bottom hem