The Darn Tough RFL Over-the-Calf Ultra-light is made to perform in a whole range of conditions: Sun or sleet, corduroy or powder, these socks are ready to take it on. For skiers who demand a tight fitting boot and cannot compromise on thickness in their ski socks, Darn Tough Over-the-Calf Ultra-light ski sock is the answer. We found the Darn Tough to be snug if even tight fitting, but thought it was lacking in the cozy feeling we got from socks like the SmartWool PhD Ski Medium.
The RFL Over-the-Calf Ultra-Light, pictured above, is the updated prototype of the Over-the-Calf Ultra-Light. To learn about what's been tinkered with, keep reading.
That being said, when high output is required, the Darn Tough is vey efficient at staying warm, even when things became wet. If you're looking for a high performance quiver sock, not just something that makes you feel good, the Darn Tough Over-the-Calf Ultralight is a great choice.