Having someone tell you to keep calm can be an additional aggravation, but with Zazzle’s Keep Calm t-shirts you won’t mind at all! The inspiration for these shirts comes from a World War II poster made to boost the morale of the British citizens as the war raged on around them. With that in mind boost the morale of those around you by purchasing one of our amazing Keep Calm shirts. With a number of great sayings and images to go along with high quality shirts from brands like Alternative Apparel, Hanes, and Champion you’ll find one to purchase for all the important people in your life. We offer 24 hour shipping on most orders so you’ll get to wear your new shirt quickly. Stop what you’re doing and grab a couple of our Keep Calm t-shirts right now!