Smartwool has what you need to keep your head and hands warm. Their cuffed beanie and lids keep your head at a temperature Goldilocks would want. Smartwool neck gaiters keep your neck warm, and their gloves are great for warmth and for training.
Smartwool socks are made from New Zealand merino wool and meet the highest standards for quality. Whether you are hiking, running, or heading to the office, Smartwool has a sock for you.
You think they just make socks? You are missing out on the best layering pieces. Microweight for next to skin, lightweight if you need a little more body and midweight crews and bottoms for when it is really cold. Smartwool has the layer you need to keep you comfortable.
The University of Otago in New Zealand compared SmartWool NTS baselayers to synthetic baselayers; they found that the SmartWool baselayers more effectively regulated:
Your core temperature Your heart rate Lactic acid build-up