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I endorse what Nick-D says
I already had my Everest Mummy bag (now 40 years old and weights 2kg) so didn't need to purchase anything.
But if I was in the market for on the Burrow 20 would be a good...

Any silver coated material works by reflecting radiant heat and looses most of its efficiency if it make contact.
You can easily test this at home by getting a sheet of aluminium foil (kitchen...

Do you remember how much your original setup weighed Madjon_

What makes the Supershelter work is that you have a air space between your body and the foam pad which is cupped so it molds to you body shape and you also have a space blanket (survival blanket) on...

I use a Hennessy Hammock with their supershelter and have used it in temps as low as -5 with snow on the ground.
I sleep in undies and a tshirt most of the time with my Everest Mummy sleeping bag...