This summer I lost my belay jacket in the Wind River Mountains. It was a Mammut Stratus Hooded jacket (877g), pretty much a clone of a DAS Parka, and though it was a little tight in the arms, I loved that jacket. When ice or alpine climbing in the winter, I could throw it on at a rest or belay and batten down the hatches, and no matter what the weather, I could stay relatively warm. It could unzip from the bottom so it wouldn't interfere with a harness and belay device, it had big mesh pockets on the inside to dry out gloves, and a huge hood to hold in the heat.
Since I lost it, I've considered rethinking my belay jacket system - though it didn't really have any problems - I've wondered if there was a way to maybe lighten up, increase versatility, and maybe increase warmth by using two lighter jackets doubled up.
Before I could think about it long and hard, I fell in love with a RAB Generator Alpine jacket (520g) on sale in the store and bought it on impulse, thinking it was awesome and could maybe play a part in a dual belay jacket system. It fit awesome, looked great and had all the features I was looking for - its just a little thin on it's own. So, I'm looking for something to pair it with. Or for someone to talk me into going back to one big jacket.
I've been thinking that having a Thermawrap UL (263g) either over or under the RAB might work; it would definitely be lighter, though not sure warmer, especially since it lacks a hood. How much hood do I really need though? I'll have a hood on the RAB, and likely one on my outer climbing layer, in addition to my helmet and beanie. I imagine a good hood helps holds heat coming up around the neck a little better, but having two hoods from separate puffys could get cumbersome.
Requirements for overall system:
Synthetic - Too many pokey things around, I don't need down spilling everywhere. Also things could get soaking wet...
Weight very near to what I was running before with the Mammut.
Overall warmth greater than what I had before (240 g MTI Ajungilak Inusulation).
I'll be used for Scottish winter climbing and anywhere in the lower 48 in winter down to -10F.
Suggestions? I'd love to hear some technical details (clo and whatnot) about any of these pieces, especially from Mr. Nisley.