This Sunbrella tarp is 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 Brass Rolled Rim Spur Grommets are placed on the corners and every 16" inches. Sunbrella tarps under 5 feet in width will made from one single length of fabric. All larger tarps will be sewn in two or more pieces.