- Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester
- Machine Wash
- Official Licensed Fan Art
- Designed by Geek Nerdy
- Lightweight, Classic fit, Double-needle sleeve and bottom hem
Neil deGrasse Tyson has pledged to contribute portions of the proceeds he receives from sales of this item to not-for-profit organizations that serve science literacy in the United States and around the world.