When wet, leather absorbs water and becomes heavy and unpleasant. Nikwax Waterproofing Wax for Leatherâ„¢ is really a safe product which maintains breathability and replenishes water repellency in full grain leather. It offers instant Durable Water Repellency (DWR) to dry or wet leather without compromising the breathability or over softening the item. Alternative waterproofing products leave behind a surface coating that may inhibit or reduce breathability, resulting in wet feet from condensation.