In reply to ColdWill:
> It's the fleecy part of the hybrid that I'm on about
In the Simond Hybrid, it's a thin waffle fleece in armpits, and a strip along the rear raglan seam, to allow articulation. It's not a thick internal panel; in fact, one of the downsides is that the fleece has no wind protection in those points... The upper arms are synthetic insulation, and the forearms are softshell, with a stretch fabric at the cuff.
I'm not saying the Simond is what you want, just trying to correct misconceptions about its design; it's primarily a synthetic/soft shell jacket, with a little bit of fleece at the armpits, for venting.