Consider it a second skin - an effective safeguard against friction and blistering.

Used by veteran climbers backpackers and trail runners worldwide the liner sock creates a friction buffer between the foot and outer sock. Assuming there is adequate volume within the hiking or running shoe this additional layer takes the brunt of any rubbing not your foot. The SmartWool Hiking Liner Crew sock is a great option for trying this technique. If you're suffering from blisters and hot spots give this solution a try. Also the SmartWool Hiking Liner Crew provides a touch more warmth for cold conditions.