I understand what you mean about double zips on a belay jacket. I have a Rock & Ice and with the double zip, it is not something that I would want to be taking off and on all day. Double zips are for parkas that get put on and stay on. The weight that you got for the Helios is about the same as my XL Torre.
Thanks for all of the information that you accumulated on these jackets.
Any feedback on the Rab parka(s)?