Personalized Merry Christmas Santa Reindeer Long Sleeve T-Shirt. Merry Christmas! Santa Claus is surrounded by a few of his reindeer, holding Christmas gifts and wearing sweaters and party hats. 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