Science T-Shirt Mens Womens And Kids Styles 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 Science Shirts Make Great Gifts Science Is The New Rock And Roll Tee Shirt Lightweight, Classic fit, Double-needle sleeve and bottom hem