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Your strict running regimen doesn't seem so rigorous once you slip on the Icebreaker Run Ultralite Micro Sock. Plus, it comes in a two-pack so you don't have to do laundry quite as often.

  • Natural merino wool helps the sock breathe, regulate temperature, wick moisture, and resist the build-up of odors
  • Top breathable vents dump excess heat when you decide to sprint the last mile to the trailhead
  • Y heel, instep support, and Achilles support keep the fit feeling natural
  • Smooth LIN toe seam and anatomical toe box feel great and prevent rubbing and blistering
  • Reinforced heel and toe enhance durability
  • Reviews
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Good Stuff!

  • Familiarity:I've put it through the wringer
  • Fit:Runs large

Great sock, however runs large. Wear 11.5 and found after buying size large - as usual with Icebreaker - first had to size down to a medium. Nice, snug fit now. No blisters, no swampy feet. 100% satisfied and lovin' it!

I heart Icebreaker socks

    I own this particular pair/style of IB socks in a medium. I'm a men's size 10 or 10.5, and the mediums fit fine. (I also own other styles of IB socks in large, and don't notice a huge difference in fit.) Icebreaker socks are my favorite socks for running, and are head and shoulders above comparable Smart Wool products.

    These socks are the bomb!

      I wear these socks as much as I can. The are comfortable, soft, and last a really long time. I used to have cotton socks, but would always have to replace them year after year. With these that won't happen. I have a size 10 1/2 foot and I get a medium.

      Excellent Socks

      • Familiarity:I've put it through the wringer

      I have 6 pairs of these, and wear them exclusively when working out, crossfitting, or running. They're great socks, they keep my feet warm when it's cold out, and cool when it's warm out. They wash well in the regular cycle, and don't seem to get smelly if I wear the same pair over and over again. Now Icebreaker just needs to make dress socks so I can get those too!

      Great first pair of merino running socks

      • Familiarity:I've used it several times

      I'm a fan of these! They're deceptively warm in brisk fall weather for how thin they are. I like the heel, which is raised a bit more than most running socks and offers a bit more protection with a rider range of shoes.