Winter Clothing

[Crankin]

I have never worn sock liners cycling; when it's below a certain temperature, I add chemical heaters, in addition to Woolie Bullies and my booties.
I do use the silk sock liners when I x country ski. I guess you could wear them as another layer when cycling, but you would have to make sure there's enough room for circulation or you will be miserable.

[Cataboo]

I've never worn sock liners cycling... but I do wear them hiking & skiing. If your foot is moving within the boot, having a liner sort of reduces the impact of the rubbing and reduces the likelihood of blisters. I forgot to bring liners my last backpacking trip, I was wearing thick hiking smartwool socks and ended up with some massive blisters.