On The X-Files, Fox Mulder had a poster that stated I Want To Believe in his basement office at FBI headquarters. The poster became a trademark of sorts for the long-running series. This X-Files t-shirt is similar to the famous poster, as it reads: Believe with a UFO flying overhead. For any fan of The X-Files, this Believe t-shirt is a must have. This black adult t-shirt is made of 100% cotton. Be sure to check out our Size Chart to get an idea of the average size and dimensions of this X-Files UFO Believe T-Shirt. Check back often for some of our new X-Files and other X-Files items at great prices only at Animation Shops.