Personalized 13th Birthday Party Gift Men's V-Neck T-Shirt. 13th Birthday Party Men's V-Neck T-Shirt - White has a unique and colorful balloon and stars logo in rainbow lettering with Party - 13 Rocks bday slogan. Get ready to celebrate in style. 4.7 oz., 100% pre-shrunk cotton Narrow, set-in 1x1 mitered V-neck collar Shoulder-to-shoulder taping Double-needle stitched sleeves and bottom hem