Nikwax Polar Proof is a washing machine-applied waterproofing treatment for all fleece, synthetic and wool insulated clothing. Restores water-repellency to synthetic and wool insulated clothing. Adds water-repellency while maintaining breathability. Ideal for skiwear, fleece and Polartec. 100% Water based and Biodegradeable. Contains NO flourocarbons/VOCs. Nikwax..Easier, Safer, Drier.