303® High Tech Fabric Guard™ is a premium, patented formula that restores fabrics’ lost water and stain repellency. Recommended as the best fabric protectant by leading outdoor-fabric manufacturer Sunbrella®, 303 High Tech Fabric Guard restores water repellency, which guards against mildew formation, prevents leaks, resists soiling, and protects against both water- and oil-based stains. Treated fabrics maintain their original colors and remain breathable.