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Darn Tough socks. Lifetime warranty, made in USA.
Surplus Poly-Pros on Ebay for cold weather.
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If he can get any of the newer waffle pattern as surplus those should be better
I still wear my old military polys but that's because I had so many sets when we transitioned to the waffles
Unfortunately I didn't have much more than my basic issue of the waffles when I retired
OP, if its getting really cold you might need to look at doing more than retaining heat, but providing some of your own
Last year when it was so very cold around here I revisited my childhood and picked up a couple of these to use
http://www.dickssportinggoods.com/product/index.jsp?productId=66638036&camp=CSE:GooglePLA:66638036:21619907:HUNTING&CAGPSPN=pla&CAWELAID=120138600003415453&catargetid=120138600002758194&cadevice=c