Personalized Unicorn Believe Long Sleeve T-Shirt. Believe! A cute rainbow maned unicorn winks and gives the thumbs up while holding a mug of beer. Funny gift for anyone who loves unicorns and beer. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL