Personalized Owl 100 Days 6th Grade Men's Tank Top. Funny 100th Day of School Men's Tank Top - Black for grade school teachers and students with 3 cute owls on a yellow ruler says 100th DAY OF 6TH Grade. Celebrate being 100 days smarter. Pre-shrunk 100% cotton 6.1 ounce Quarter turned Adult: S, M, L, XL, 2XL