I see no good reason 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 Awesome, Birthday, Power Sports, Bodybuilding, Friend, Christmas, Familie, Father, Fitness, star wars Funny, Geek, Nerd, Humor, Comic, Computer, Gamer, Internet, Game, I See No Good Reason To Act My Age Lightweight, Classic fit, Double-needle sleeve and bottom hem