An ultra-thin treatment of durable water repellent polymer applied to fabric after manufacturer. The coating penetrates the fibers and lowers the surface tension of the fabric, causing water to bead up and roll off the garment instead of being absorbed. DWR is not a waterproofing treatment by itself and is gradually removed through use and washing. DWR treatments can be applied using products such as Nikwax® and Grangers®.

For some information about testing DWR coatings check out this page.