Darn Tough RFL Thermolite Socks

The RFL Thermolite Sock is another great addition to the lightweight and ergonomically designed attire from Darn Tough. This sock maximizes the best properties of synthetic material by implementing hollow fibers that trap air to provide incredible insulation. If you're a "sweat monster" you will appreciate that the Thermolite polyester material is quick drying and magically pulls moisture away from your skin. High on warmth, low on weight is the motto here. It's a shame no one can see these socks when they are in your boots because they sport an ergonomic pattern along the arch and ridge of the foot that provides a little extra material for support and comfort. If "thin is in" then the RFL Thermolite is definitely trending.

• Ultralight sock that provides high warmth and moisture wicking.
• Thermolite is a specially designed insulating polyester made to be warm and weigh practically nothing.
• Darn Tough's secret sock design provides the ultimate in fit and comfort.
• Pattern along the arch of the foot offers extra support.
• Synthetic design is quick-drying; no need to ring out your socks.

Update 2021/22: The redesigned "chassis" gives more arch support and a better fit over the instep.