Ores, Minerals, and Crystals Shirt Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 58% Cotton, 42% Polyester Imported Machine wash cold with like colors, dry low heat Ores, Minerals, and Crystals Shirt This Ores, Minerals, and Crystals design and other EncycloArt designs are for geology, science, and natural history nerds. This premium t-shirt is made of lightweight fine jersey fabric Fit: Slim (consider ordering a larger size for a looser fit)