I'm looking at getting a new belay jacket and am going for a synthetic one. Coldest it will be used for is winter alpine (and that's a push, will be more alpine summer/scottish winter in general). Main requirements are the usual helmet that will go over a hood, reasonably tough so it can be worn as an outer layer and good warmth to weight ratio.
I'm not quite sure what weight of insulation I should be looking for though. 100g/m seems like a fairly good level, warm but not too carzy, which seems to leave me with the options of Rab Photon X, ME Fitzroy, Montane Flux (claims it's hood will go over a helmet, but having tried it on I'm not convinved). There's then a few others at the 80g/m such as BD Stance and ME Prophet (which due to the weather resistance sounds like a pretty good general climbing emergency layer).
Unfortunately, I assume because of the time of year, these all seem a bit hard to come by, especially in the brighter colours that I prefer.
So, does anyone have thoughts on what weight of insulation strikes a good balance in a belay jacket, as well as thoughts on those that've been mentioned or any other stand out alternatives?
Thanks
Post edited at 14:26