I’ve got a OR “Winter Ferrosi” that I love. It’s got the same face material but is backed by a grid fleece type material. Warmer than the normal ferrosi and feels better on the skin IMO
I’ve been hearing some great things about primaloft yarn socks from ODLO (Norway). They come highly recommended from the high altitude mountaineering crowd and seem to easily outperform merino wool.
Rab is another brand worth checking out for high quality, hard tested bags.
You can also find some great deals on the Montbell Japan website. It’s different from the US website but they make some great stuff and it’s actually far cheaper ordering from the JPN site.
I choose to run FF and WM products mainly because they have been beat to shit by hundreds of mountaineers in far worse conditions than I will ever experience on a hunt. If it’s good enough for a Denali or Himalayan expedition it’s good enough for me.