In reply to JayPee630:
Mine is a light grey. I wore a base layer underneath it most of the time. Either a short sleeved synthetic top or a long sleeved merino top. In the UK I wear the merino top under it all the time and it's fine. I have a mate who has one as well and he raves about his as well.
If it was properly windproof then I'd say it would be the perfect UK climbing top, but sadly, it's not.
Post edited at 09:06