I've bought a lot of such things from Camofire as deals appear. They were at the Harrisburg show not this past year, but the year before, and that was awesome and dangerous all at once, lol.
I use Core4Element Merino base layers, and I look at Camofire, Sierra Trading Post, and other places for deals on anything that's high content Merino.
I use Cabela's "Ultimate" wool socks, which are 75% merino content and come in different weights. Browning makes a good high-content Merino sock, too.
Primaloft isn't a bad insulator, but not for socks. I got primaloft socks and they were horrid.
I have Primaloft layer pants and they're fantastic.
For mobile type hunting, you might also want to check out Kuiu and Sitka's shell and outer layers. Meant for mobile hunting, and well made. Pricey, but good.