Personalized 4th Birthday Cute Penguin Men's V-Neck T-Shirt. 4th Birthday Men's V-Neck T-Shirt - White has cute penguin in a party hat with the number 4 on its tummy for your child's fourth birthday celebration. 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