Columbia Bugaboo Liner Sock
Here's what other sites are saying:
A little extra room in your boots means better circulation, which in turn means warmer feet. This super-light, wicking liner insulates like a ski sock but fits ultra-sleek like a second layer of skin. Omni-Dry(R) advanced evaporation throughout wicks moisture away from your foot and is highly breathable-making the Bugaboo Liner also ideal for layering under a thicker sock in the bitterest cold. Plus, its over-the-calf construction renders a slouch-free fit.
- Altrec Outdoors