Personalized I Believe In Santa 2 Youth T-Shirt. Funny Christmas Youth T-Shirt - White with Santa cap says I BELIEVE IN SANTA... JUST BECLAUS. Perfect holiday gift for anyone who believes in Santa Claus and Christmas. 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.