Its the same idea as a DWR coating expensive jackets get from TAD and Arceryx. The coating will wear off in time and needs to be re applied with Nikwax or other DWR repellants.
The Magnum sidewinders have a IonMask treatment as they call it and I have yet to get mine to leak through in the couple years I have been wearing them. I wear them all year round. The boots are also breathable so go figure. Air can go through a smaller hole then water.
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