FJ HydroKnit is a 100% waterproof shell. Combining lightweight fabrics with a specifically engineered 3 layer bonded knit fabrication makes this outerwear piece one of the lightest garments ever produced by FJ. A Durable Water Repellent Finish helps keep you dry during mist or light rain conditions. Allows for non-restricted movement during the golf swing. Seam sealed for complete waterproofing. FootJoy warrants that this piece of outerwear will be 100% waterproof in normal use for two years (U.S. Warranty). 100% Polyester.