This is an Appy Trails tarp footprint for use with the Mark III tent. 

With Boy Scouts this floor is recommended, though you can still make your own with plastic or Tyvek etc.

The material is 190T polyester with a 4000 pu coating.  Weight 11.8 oz.

When not used as a footprint the unit can be hung as a tarp, with extra grommet positions for this purpose.  And it can be rigged as a stand-alone shelter.