the most important things to keep warm are your feet and your head,about 60%of bodey heat is lost via an uncovered head, and once your feet are cold you soon loose the enthusiasum for observing.
I have a lightweight thermal suit which I put over a Tshirt and Track suit and Moon Boots, but if it gets realy cold its out with the Freezer suit, the same worne by the guys and girls who work for woolies and coles, and my Russian fur hat and I can go all night and be as warm as toast. astroron
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