“…made from propore, which is the same stuff dri-ducks are made of.”

Yes, they’re both made from propore. But they have a different weave to them. I sweated more in dri-ducks. And the O2 is slightly lighter.
My avatar shows me wearing it.

I vary between Rainshield and a $1 poncho (usually taking both). The poncho does a nice job of keeping my pack dry. I sweat more in the poncho so I reserve it for hard rain in cool days.

-Barry