I’m looking for a super warm winter coat that will last me forever. Something that will keep me warm around -30 C. I’m thinking military surplus, because it should theoretically be more durable (right?).
Price isn’t a huge issue if the quality is worth it.
Take a look at the US Army ECWS layering concept. Layer 7 is a winter insulation layer with primaloft.
Surplus does often just mean lowest bidder, but you can find some civilian brands like Helikon-Tex (Poland). They take an adapt (and improve) on gear.
The Dutch military used an insulation jacket made by Snugpak. When it comes to real good stuff, I would always recommend Snugpak and Carinthia 🤑(especially the LIG/MIG/HIG or ECIG series). The later is just superb (rated for -30˚C)
+1 for Helikon, got lots of their stuff and love it, great value