The Devold Hiking Merino Liner is a comfortable, thin sock. This makes it the perfect sock for long hikes, as the thin material minimizes the risk of blisters. If, like many of us, you get cold feet easily, this is the right sock to wear inside a slightly thicker sock. Hiking Liner under a Hiking Medium is a good combination for winter. Hiking Liner is anatomically designed for left and right feet, has a Y-heel with comfortable knit at the calf and an ankle area for a stable, perfect fit. Ventilated mesh areas are integrated for optimal temperature regulation, and reinforced toe and heel areas provide extra durability.