[rlmorel]

I have to say, I didn’t see a survival blanket. I have one those, they don’t take up much space.

[Harmless Teddy Bear]

Wool blanket is better then a survival blanket.

A survival blanket is ok when you have to worry about weight or space. I carry one in my "oops kit" when I go for a day in the woods. But wool is much better.

[V K Lee]

Look again, Warm Blanket #3.
Survival is assumed.(ass, u, me, d)

[DUMBGRUNT]

—” I didn’t see a survival blanket.”

Better than nothing, but do not bet your life on one.

Heat moves from hot to cold, three ways, convection (WIND), conduction(touch), and radiation (sun from space).

They do help with radiant and some convection loss.
No insulation is provided.

Test one.
It is 11F here in DuPage, run outside and wrap up in one and see how it works. Without solar gain or heavy insulated clothes /blankets...

Wool will retain 40% of its dry insulating value when 100% water-saturated, cotton, down, poly; not so much.

Check out a wool antique wetsuit, the old guys were tough!