Haven't done any serious winter riding for a number of years but winter is never too serious in Parker County, Texas. I remember putting plastic sandwich bags on over my socks before riding in the 60's. Kept them warm and toasty, Have some "space" material socks I use for winter fishing, plan to try them for riding this year, also have gloves of the same material. they work great out on the boat in winter so expect them to do the same while riding. bought them from
www.sportsmansguide.com they have all kinds of goodies. It's still in the 90's here so I haven't even thought about cold yet.