As for sources I'm not sure.

On the liner issue we use two layers in the Navy. A cotton, thin lining sock with a wool, thick sock with our boots. Works well.

As for the modern synthetic liners, like the new tees that are all the rage I not all that sure about. They will pull moisture away from your body quickly and for tees that puts it into the air quickly preventing things like rashes. I still prefer cotton myself and that is with having spent 5 years in a 140F engine room.

As how they would work for sock liners not quite sure because you would need some place for the moisture to go. If you don't have ventilated boots I'm not sure how well the synthetics would work.

While not hose (they're a bit shorter) if you want pure wool at a decent price check military supplies.

Jim