For transportation cyclists a high tech base layer may be appropriate, but for me, I’ll stay home.–corrie
For winter riding in the past I have used several kinds of base layers. I have ridden with long underwear and some Sporthill tights from my running days and both methods were sufficient, but not entirely comfortable. Columbia Sportswear has been making a marketing push recently and a technology that caught my eye was what they call Omni-Heat, billed as as thermal reflective technology. I have never purchased a matching base layer of any kind and decided to go for their heavyweight longsleeve top and matching bottom.