Personalized Sweet 16 Spiral Youth T-Shirt. Sweet 16th birthday Youth T-Shirt - White with pretty pink spiral with all her birthdays, 1st through 16th. The number 16 has a heart in it. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.