We’ll admit—we seriously geeked out when designing this sock. Our goal was to create the perfect fusion between boot ...

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Product Review

We’ll admit—we seriously geeked out when designing this sock. Our goal was to create the perfect fusion between boot and sock. The result was the Function 5. We worked closely with boot fitters to dial in five precisely located comfort pads that diminish pressure points for the ultimate fit. Shin padding protects from “shin bang” while Achilles padding reduces heel lift. We even developed a pad zone that protects the top of the foot from second buckle pressure. Plus nothing feels better than the warmth Merino Wool provides when the mercury drops. If you’re a sock geek you’ll love the attention to detail we put into this sock. Still made in Vermont. Guaranteed for life.

  • Midweight with Cushion - A warm and extremely comfortable choice when conditions demand it, this fine gauge knitted sock provides mid-level cushion density under your foot. True Seamless technology allows for an undetectable seam fusion for an Ultra-smooth, invisible feel.
  • Over-The-Calf Height - The name says it all. The ultimate height for keeping the outside-out.
  • Composition - Knit with 66% Merino Wool, 32% Nylon, 2% Lycra Spandex. The fast action wicking pulls moisture away from skin, so no more sweaty, stinky socks. The soft, breathable merino wool has fast drying, all weather performance that keeps you cool in the summer and warm in the winter.
  • Guaranteed For Life - If these socks wear, tear, or develop holes, Darn Tough will replace them. No strings. No conditions.
  • Made in the USA - Every pair of socks is knit in Northfield, Vermont - the perfect testing ground for the finest premium all weather performance socks.

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