Durable Water Repellent (DWR) is a chemical application that manufacturers use to create rain-proof gear, like rain jackets, rain pants, and waterproof backpacks. DWRs make water bead up, then disperse, preventing surface moisture from accumulating on rainwear. Even in a waterproof jacket, it is important that the surface doesn’t just keep water out, but pushes water away. If you have a soggy surface, your skin feels clammy and wet, even if the water does not actually penetrate the surface.

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