When it comes to Canvas material, our Iron Horse Synthetic 100% Water Proof Canvas is the absolute best. Its 100% American Made, manufactured by us right here in the great U.S.A. and is made using Silicone Treated Yarn. Its twice as strong as cotton canvas, 14.5 oz./sq. yd. material has many extraordinary advantages over water resistant canvas tarp fabric, Dry finish does not stain or have a chemical odor, Breathable eliminates condensation and has Brass Grommets spaced every 2' on all sides.