Show Your Work T-Shirt Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Whether you're a teacher talking about your student's math problem (common core or traditional) or something else entirely a t-shirt with this graphic, text design is perfect. Show Your Work in bold distressed text - Perfect gift for math or science teachers on Teacher Appreciation Day. Arithmetic, mathematics, math, teacher, professor. Great Back to School T-shirt too! Lightweight, Classic fit, Double-needle sleeve and bottom hem