Back Off I Have A Sister & I'm Not Afraid To Use Her T-Shirt 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 Design unique to Amazon Multiple color variations and in men's, women's, and youth sizes for your choice and comfort Lightweight, Classic fit, Double-needle sleeve and bottom hem