Tyvek

[bret]

I liked Tyvek (1443) a lot for a footprint until it got soaked from heavy rain and went from 4oz to 12oz (weighed when I got home). Now I'm going to use thin plastic that will not soak up water. YMMV but holding a half pound of rain is a deal breaker for me.

[Franco]

Standard Homewrap Tyvek is much better as a groundsheet.
just roll it up, twist the ends and it is soft enough to use without that loud sound it makes when new.