In reply to Mark Bull:
Been using the Velez Adventure smock all this winter in preference to my much heavier Aspiro smock.
The hood as you say isn't as good over a helmet and the wrist closers being only velcro do not have the additional poppers.
It's also a lot shorter and as someone has already mentioned doesn't protect your lower torso so well, it also works out of your harness if you are not carefull!
It is however a lot lighter for carrying in your rucksack and less bulky so you can see your harness and much better without the irritating Aspiro pit zips that constantly opening.
The lighweight version is definitely not as durable and the unless it was a least 200 grams lighter I'd give it a miss for proper climbing!!!!