I'm looking to carry one in my BOB (which I always have close).  I Like the fact that its lightweight and can go pretty much anywhere.  The insulation issue has me concerned though.  I have a combat casualty blanket that I would use to keep the wind out, reflect heat etc.
 http://www.uscav.com/Productinfo.aspx?productID=7953&TabID=548 Any advice/opinions are appreciated.
Thanks 
Blitz