When it comes to the ability of a “waterproof” or “water resistant” garment, the sheer quality of DWR treatment can make the difference between being dry and wet. But sometimes that treatment won’t be enough.
Water has a weird way of finding itself in places that some wouldn’t think is usually a location of breach of security. But surprisingly, water will always prevail (lol).
Seams on a garment may seem tightly wound together in many clothe articles, but in the situation of a DWR treated jacket or pant, the water will have a possibility of trickling into the seams, and ultimately through to your skin.
That is why many companies, relating to outdoor or weather proof related articles of clothing, will tape their seams. This seam style will reduce any crevices in which water is able to breach.