In reply to top cat:
> If you are using it as a belay jacket then it NEEDS to:
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> Have a 2 way zip so that you can open it at the bottom to access your harness/belay devise.
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> If it doesn't do the above it is not a belay jacket no matter what the manufacturers tell you.
I don't agree with this one although the other points I think are all good.
http://www.ukclimbing.com/gear/review.php?id=1375 I can't remember which jacket of mine had a two way zip, but it was a total faff coming undone when you didn't want it to. I much prefer the base of my belay jacket to be snug and to stay down over my bum and I've never found it necessary to unzip the base of the jacket to belay - just pull the front of the jacket up slightly if needed.
If the jacket does have a two way zip make sure its a decent locking one and won't come undone when you don't want it to.