In reply to Aonach:
The 20D face fabric appears to be a mistake, the specs on the site seem much more realistic:
145 gsm 3 layer fabric
Face: 40 D x 90 D Nylon
Backer: 20 D Nylon tricot
Bi-component PU/PTFE membrane
20d nylon tricot
Hydrostatic head: 30,000 mm
MVTR: 20,000 g/sqm/24hrs
100% windproof
PFOA Free C6 DWR
YKK Aquaguard zips
Weight (g): S: 485, M: 490, L: 530, XL: 550 , XXL: 580