In reply to
A bit of history.
Rab told me that the original idea was a request from a certain P Livesey for a down top.
For mountain marathons and had to be as warm as possible but only one pound in weight.
Just weighed my pre production sample. Gore Tex covered, no pocket or hood, 470 grams.
The 16g extra to one pound might be the encrusted grime and a bit of extra velcro to attach a hood