Special durable construction for multi-purpose use where a breathable fabric is necessary to prevent rot or rust on objects being protected. The 14.90 oz. Royal is suitable for long-run hauling. Heavy triangular patches made of four layers of canvas. Provides extra strength at eyelet stress points. Brass rustproof grommets are conveniently spaced every 3-4 feet. Like all canvas tarps the Royal is specially treated to resist water and mildew. All seams are double stitched with heavy duty, rot resistant thread.