Personalized Nice Until Proven Naughty Youth T-Shirt. Nice Until Proven Naughty. Santa Claus is watching, but everybody needs a little breathing room. Funny Christmas gift for everyone, whether they're naughty or nice! 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.