Here are some of the warmest socks available based on the search results:

1. Warrior Alpaca Socks: Ultimate Toasty Toes (on Amazon)
2. Darn Tough Socks: Merino Mountaineering Hiker
3. Patagonia: Classic Fitzroy Heavyweight
4. Bombas Merino Wool Terry Calf Socks
5. Heat Holders Lite Crew Sock
6. Yoicy Super Thick Socks (3 Pairs)
7. Swiftwick Pursuit Hike Eight Heavy Cushion Socks
8. Blue Flame Footwears manmade fabric socks
9. Merino Comfort Hiker
10. Merino Wool Calf Socks
11. Darn Tough Athletic Sock
12. Unbound Merino Mens All Season Crew Socks

According to the search results, the warmest socks use premium yarns from specialized wools with very high insulation properties. Synthetic materials still can’t rival premium wool socks for warmth. Wool locks in your body heat while letting your feet breath at the same time. It also pulls the moisture off your skin to prevent sweaty feet.