Midwest Wide Number Cotton Duck 8 36 Inch Tarp and Tent Fabric is an unbleached, natural, rugged canvas indoor/outdoor fabric. This tightly woven cotton duck canvas can be used for outdoor upholstery, floor cloths, canoes, tarps, and more. Inexpensive, and highly durable, Midwest Wide Cotton Duck may be treated for long lasting wear. Artists use Midwest Wide cotton duck for creating custom Artists' Canvas.