What's the deal with the side zip for venting and making the anorak easier to put on? Is that the same as the pictured front pocket?
How much down fill does this have? (size M)
Is the R value of 2.9 just for the 1.5" thick portion of the pad, or the average insulation value across the entire pad? (i.e. more than 2.9 at the torso and less at the feet)