Wash-in waterproofing for fleece, wool, fibre-pile and synthetic fabrics including ski wear. It helps to maintain the air gap between the knit and weave, keeping the wearer warm and comfortable while repelling water from the surface in wet or humid conditions, keeping the wearer dry. Nikwax Polar Proof Waterproofing Wash-in Features: Adds / renews water repellency and revives breathability Maintains insulation, keeping you warm Minimises weight gain Prolongs the life of gear and optimises performance in wet weather Easy to apply - can be used in a washing machine, no tumble drying required Will not affect cosmetic appearance WaterBased - environmentally friendly, biodegradable, non flammable, non hazardous Does not contain fluorocarbons