I am looking to cut a few ounces on my shelter.
I have a Copper Spur UL2, the footprint weighs over 7 ounces
The advertised weight of 5 oz. is BS anyhow I will not setup my tent without a footprint, so leaving it out of my gear is not an option. I also will not use a polycro sheet, it needs to be durable.
I was wondering if Tyvec of the same size would be lighter, If I can save three ounces I will be happy.

Also if Tyvec is an option, where can I get a Tyvec sheet?