If you want extremely high quality then I would recommend Woolpower. It's a Swedish brand that produce all their products in Sweden, the wool is sadly from Urugay so it's not Swedish wool but they are working on that even the wool will be from Sweden in the future when the supply of wool in Sweden is enough.

I know people that bought Woolpower garments back in the 90’s that still uses the same once and the Swedish military uses socks, thermal underwear and midlayers from Woolpower.