Our black and white tshirts are 100% cotton. Grey and other colors may be poly blends. They are so soft made of ring spun cotton. They are slightly oversized as they are sized unisex so slightly larger than women’s sizing. If you want a snug fit, size down, for a loose fit, choose your regular size, for oversized, go up! Men can order their regular size. Please wash inside out on a cold cycle and hang dry for longevity.