I got one of these to keep me warm whilst sky gazing at night. As many of the best nights for observing the night sky are winter nights, keeping warm can be a problem. Well not with one of these. I've used mine about 6 or 7 times know, and usually wear a thermal under suit next to the skin and one of these. It's brilliant, keeps me very warm (lowest temp so far -7) and gives me the freedom and flexibility to use the scope and keep the viewing to the maximum. When you need to take the out, cup of coffee etc, you can sit down in the suit, do what ever you want then back to gazing.
I have yet to find the down side to the suit and I am sure I won't. Well worth the money and quality should ensure a long life out of the Sac.
Harry Lime, Leicestershire - 2nd March 2013
Firebox says: Everyone loves a bit of warm sky gazing, great review, thanks Harry.