Just brief follow-up to this post.
I ordered two of these blankets and received them yesterday.
They are not exactly like the mil issue ponch liners. Probably better made, the cover material is a heavier non-ripstop nylon, dacron, or something. So it's a bit heavier and bulkier than the mil type poncho liner.
Not a problem for family camping and I don't regret buying them, but please note there is a difference in the two. It could be that the Wiggy's liner is warmer too. YMMV
Cheers,
Tom A.