I think General Electric licensed it (eVent technology) out so that multiple companies could use and sell the fabric and even re name/brand it.
Not so with Gore Tex--it has to keep the name and they are very strict about who gets it, and the specifications it has to meet--especially when sold as a pre made garment.
Long time ago, i made a bivy with a bottom of Polartec Power shield fabric and top of mesh.
The idea was that in good and warm weather, the powershield went on bottom and mesh on top, and in rainy, stormy weather or cold weather it reversed. Since i always use a ground cover and some kind of pad (usually inflatable), wasn't worried about getting wet on the bottom.
It was a good idea, but the fabric is too heavy. Was before my BPL and UL days.