From Our Knowlege in Self edition:
The youth blend hooded sweatshirt is made of ultra-soft, preshrunk fleece that feels wonderful against the skin. The garment is 50% cotton 50% polyester with reduced lint buildup. This makes an excellent combination for printing. The front has a kangaroo pocket big enough for both hands. The neck is reinforced with twill taping.
.: 50% cotton, 50% polyester (fiber content may vary for different colors)
.: Medium fabric (7.75 oz /yd² (262 g/m²))
.: Regular Fit
.: Sewn in label
.: Runs true to size