Personalized Keep Calm Black Friday Long Sleeve T-Shirt. Funny Long Sleeve T-Shirt - White 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! Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL