Retro Coffee E=mc2 Unisex t-shirt. This t-shirt is everything you've dreamed of and more. It feels soft and lightweight, with the right amount of stretch. It's comfortable and flattering for all. • 100% combed and ring-spun cotton (Heather colors contain polyester) • Fabric weight: 4.2 oz/yd² (142 g/m²) • Pre-shrunk fabric • Side-seamed construction • Shoulder-to-shoulder taping • Blank product sourced from Guatemala, Nicaragua, Mexico, Honduras, or the US