The RFL Thermolite OTC Sock is another great addition to the lightweight and ergonomically designed attire from Darn Tough. This sock maximizes all the best features of synthetic material by implementing hollow fibers that trap air to provide incredible insulating properties. 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 OTC is definitely trending.
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42% Thermolite® Polyester