Gravitational Waves LIGO T-Shirt Vintage 2016 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 Gravitational Waves LIGO T-Shirt Vintage 2016 LIGO discovered the Science Ripple Effect in Space from Black Holes, Planets Stars, our Galaxy and the Universe. Albert was right after all. In men's, women's, and youth sizes for your choice and comfort. This tee is perfect for a birthday, Christmas, graduation, or any gift giving occasion. Multiple color variations available. Lightweight, Classic fit, Double-needle sleeve and bottom hem