These Sunbrella tarps are manufactured to the same rugged standards of our shade and heavy duty vinyl tarps. Sunbrella is a breathable fabric that is the standard in the boating industry. Sunbrella is not waterproof but has excellent water repellency. Northwest Tarp Canvas is proud to offer these Sunbrella tarps manufactured with the same Sunbrella boat canvas fabric found on most boat canvas tops. The webbing is sewn on around the edges for added strength and the #4 1/2" Inch Stainless Steel Rolled Rim Spur Grommets are placed on the corners and every 16" inches. The finished size on our tarps is the stated size. We don't sell "cut size" tarps. The tarp you receive may even be a 1/2" or so larger than the stated size to allow for shrinkage over time. We don't make your tarp until you order it so if you need modifications such as changes to grommet placement of other configuration please let us know when you order. Sunbrella Tarp - Genuine Sunbrella Acrylic Fabric Jet Black #6008 Heavy Duty Polypropylene Webbing Sewn On for Reinforced Edges Stainless Steel #4 1/2" Spur Grommets Placed on Corners Every 16" Inches 10 Year Manufacturers Warranty on Sunbrella Fabric Marine Grade Sunbrella Boat Top Awning Fabric