-frequently wash your jacket with a mild soap (not a detergent!). This removes accumulated body oils and other grime that 'clog' the waterproofing material's micro-pores which allow your jacket to breathe.
-after washing - and when the jacket is still! wet - hang it on a hanger and apply your DWR. The wet face fabric facilitates an even application of the DWR over the jacket's surface. A few minutes after this is done and excess DWR had run off your still hanging jacket, tumble dry your jacket dry on a low heat setting. The moderate heat from the tumble drying activates/reactivates the water-beading properties of the DWR (which in turn facilitate the jacket's ability to breathe when it's raining).
Quite often, it's simply enough to just wash the jacket and then tumble dry the jacket to get water on the face fabric to bead up again. Again, this is because heat in itself reactivates any existing DWR that has only temporarily lost its ability to bead water (it's a chemistry thing). If this trick doesn't work then it's indeed time to re-DWR your jacket.
Note: many people erroneously believe that frequent washing will quickly degrade the oft expensive jacket's magic properties. The opposite is true - wash frequently and the magic of a breathable yet waterproof jacket will last so much longer!
DWR and concomitant breathability coefficients in the lab and the field b da trees.
DWR only fills the role of 'water proofer' w/ non-Gore-Tex type textiles (e.g. Pertex, Luminara, Gossamera,...). All this imho, of course.
With Gore-Tex, the material is waterproof - end of story. The DWR is applied for one reason, namely to prevent the face fabric from wetting out (the material remains waterproof even when the surface fabric has wetted out).
When the surface fabric has wetted out, you will remain protected from precipitation but your jacket's ability to breathe will be significantly reduced. Such decreased breathability will reduce the materials ability to allow perspiration to pass from beneath the jacket to its outside, This in turn will entail that you will get wet/soaked from your own perspiration even though no water leaks through the jacket from the outside.
In summary, the purpose of the DWR is to allow your jacket to breathe. That's it and everything.
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