Darn Tough RFL Thermolite OTC Ultra Light Socks

As low as $17.00 Regular Price $23.00
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Darn Tough RFL Thermolite OTC Ultra Light Sock

The Darn Tough RFL Thermolite Over The Calf Ultra Light Sock is Darn Tough's lightest race day sock: light as air, and tough as nails. Made with Theromolite® insulation, a material engineered to provide warmth and comfort without weight, this is the sock for the person who prefers a synthetic sock in their race fit, or custom fit, boot. Slim under the foot fabric hugs the instep, smooth True Seamless™ for toe construction without bulk, these socks don't chafe, bunch, or slip down. Same fine gauge knitting you've come to expect from Darn Tough, same attention to detail, in a synthetic sock with the technical advantage of Thermolite™. These are light, quick to dry, socks with antimicrobial properties and all the wicking advantage you'd expect in a synthetic sock. Your feet will stay dryer, longer, which will keep you warmer. Machine wash, we prefer to line dry rather than subject something that dries this quickly to dryer heat. A slim comfortable ski sock done in synthetic fibers with technical features for additional warmth designed to meet the specifications of the person who prefers a light sock in their boot for the firm interface of a customized boot experience.


  • Performance Fit
  • Fine Gauge Knitting
  • Fast Action Wicking
  • All Weather Performance
  • Naturally Antimicrobial
  • THERMOLITE®: Insulated
  • Guaranteed For Life: No strings. No conditions. For life.
  • 55% Nylon, 42% Thermolite® Polyester, 3% Lycra® Spandex
  • True Seamless™: Undetectable seam fusion for an ultra smooth, invisible feel.
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Brand Darn Tough
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