My Feathered Friends Hyperion Jacket was made with W/B fabric but it had sewn through construction, on top of that I've ripped the shell twice and had it repaired. Therefore, it is anything but waterproof but it does a good job at holding off the wind.
I have never counted on it to hold out the rain or elements. I have hiked with this jacket about 3 miles in ten years. It's too stinking warm for most temperatures I hike in. However, two of those miles are on the MMWT in August and September when temperatures were in the single digits.
It's a small package, about 1 liter when stuffed, and about 1 lb. less than the TNF Denali jacket it replaced.
