Durable Water Repellency (DWR) refers to chemical treatments applied to fabrics to increase their resistance to water absorption. DWR chemical penetrates into the fibers and binds there, protecting the textile so that water beads and rolls off the outer layer rather than being absorbed. This helps keep fabric surfaces dry and clean, which in turn allows fabrics to main their waterproof and breathable characteristics. Significant changes to DWR chemistry are currently being developed, with reputable manufacturers and brands phasing out the use of “C8” based DWR treatments that may have negative environmental impacts. 7mesh works with vendors to ensure we use the best DWR treatments available; our fabrics do not use any C8-based DWRs.