Funny Grammar T-shirt, There They're Their (It'll Be Ok) 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 Funny Grammar T-shirt; There They're Their shirt with "It'll Be Ok If You Know the Difference" joke for English teachers, English majors, writers, book lovers, and grammarians This grammar humor tee was designed for the grammar police by BootsTees Lightweight, Classic fit, Double-needle sleeve and bottom hem