Created using an ultra-thin protective layer laminated to a lightweight textile, GORE-TEX INFINIUM™ WINDSTOPPER® products are totally windproof. Although textiles such as microfibers, closely woven fabrics and many fleece materials are often termed windproof, even light winds can penetrate most of these fabrics, making you feel chilled and uncomfortable. By Gore’s standards, a fabric can only be considered truly windproof if its air permeability is 1.0 cfm (< 5 l/m2/s) or less. It’s a standard that our products easily meet. The membrane technology in GORE-TEX INFINIUM™ WINDSTOPPER® products has billions of pores that are 900 times larger than water vapor molecules, so even though wind can’t get in, moisture from sweat vapor can easily get out.In addition to the GORE® membrane technology, a durable water repellent (DWR) treatment is applied to most of these products. This penetrates a jacket’s outer fibers, lowering the surface tension so that water beads up and rolls off. That means less water accumulation, resulting in less wind chill, and less extra weight. Choose GORE-TEX INFINIUM™ WINDSTOPPER® insulated garments for an extra layer of protection from the cold, so you can stay active even in the colder months.