DUNDER MIFFLIN PAPER COMPANY on Long Sleeve Women's Cotton T-Shirt (in 15 colors) Genuine South Horizon product. Sold exclusively by South Horizon Feminine " rib mid scoop neck; sideseamed with slightly tapered Missy fit. 5.3 oz. 100% Cotton fabric. Heather Grey is 90% cotton and 10% polyester Preshrunk Cotton. Seamless rib at neck See sizes under PRODUCT DESCRIPTION below.