Nikwax Cotton Proof is an easy to use safe high performance wash in waterproofing for cotton polycotton and canvas items Cotton clothing absorbs considerable amounts of water which can be dangerous because when wet it has very poor insulation qualities Cotton kills is the adage of many outdoor enthusiasts because they know that it will contribute to hypothermia in wet cold conditions Cotton Proof from Nikwax can add water repellency to cotton making it safer and more usable in the outdoors