So are trailer homes
I am kidding, but I think their best breathability in their $160 jacket is only 10,000 MVTR. the cheap stiff $29 a set they are to forget about. As someone who trail runs, you can get sweat out most rain gear and get weter from the inside than you often can from a downpour.
Cheap DWR etc. runs about 10,000 MTVR in both water resistance and breathability. Of course there is a bit more to consider such as pit zips, design, weight and size if it is primarily packed.
KUIU Ultra NX and 2x the breathability rating of 40,000g/m2/24hr MVTR the same 20,000g/m2/24hr water resistance as GoreTex or Event in similar products. The NX is only 8.9 oz, packs tiny and the pants are similar. The NX sits in my pack, but if I know I am traveling in rougher terrain and wearing rain gear is going to be a necessity, then I switch to the Yukon. [video]http://www.kuiu.com/hunting-rain-gear/[/video]
That said I also have Event and Gore products. Of jackets Zpack Event is one of the nicest designs for packing/backpacking the newest generation of material 60,000 g/m^2/24hr vapor transfer per the test method Joe used. [video]http://www.zpacks.com/accessories/wpb_jacket.shtml[/video]