Keep Calm and Kill Zombies 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 Zombies kill plants, animals, humans and anything in their path. It's kill of be killed. It's you vs. Zombies. Lightweight, Classic fit, Double-needle sleeve and bottom hem