Personalized Keep Calm Black Friday Youth T-Shirt. Funny Youth T-Shirt - Kelly Green for Black Friday shopping with snowflake sales tag graphic says I CAN'T KEEP CALM IT'S BLACK FRIDAY. Get ready for after Thanksgiving markdowns! 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.