Personalized Happy First Days Of School Long Sleeve T-Shirt. Not only will our Happy First Days Of School design apparel make your child look adorable, but it will also serve as a wonderful keepsake to remember this special time in their life. Capture the joy and excitement of their first day of school with our unique and charming designs. Shop now and make your child's first day of school even more memorable with our Happy First Days Of School design apparel! 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