HARRY POTTER ★ Marauder's Map UV Adult T-Shirt ＆ New Product

You'll be sure to declare "I solemnly swear I am up to no good" with this unisex, beige T-shirt. The design features a jumbo print of the iconic Marauder's Map which includes secret passages that are hidden in the Hogwarts grounds. 

When worn in the sun, the t-shirt’s ultraviolet ink changes colour to reveal footsteps, and complete the phrase “I solemnly swear that I’m up to no good”. On the reverse of the t-shirt, the special ink changes to show “Mischief Managed”.