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Heavy Expedition - Boot

91 reviews

Heavy Expedition - Boot

91 reviews

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  • The ultimate combination: Merino wool for cold weather insulation and the performance that comes from a perfect fit. There is no other heavyweight sock that can make this claim. If there were, we would have made it! This sock is loaded with 100% Merino wool on the inside against your foot, so all you feel is comfortable and dry.

    • Heavyweight full-foot cushioning for warmth and protection.
    • Durable nylon exterior for extended wear.
    • Mid-calf height works well with hunting boots.
      Merino Wool 82%
      Nylon 13%
      Polyester 3%
      Lycra® Spandex 2%


    Customer Reviews

    Based on 5 reviews Write a review

    Designed to be the best socks you've ever worn.


    Moisture Wicking

    Designed for stay-dry breathability & performance


    Full Contact Fit

    No uncomfortable bunching, slipping, or rubbing


    Smart Cushioning

    Extra padding in active zones: toe, arch, & heel


    2-Year Warranty

    Quality-made in the USA & guaranteed to last

    Merino Wool

    All our socks are made with 18.5m superfine weave, suit-grade performance Merino wool.

    Odor Resistant



    Omega Performance Yarn

    Our custom blend of man-made fibers selected for the best breathability and fit.



    Moisture Wicking

    Customer Reviews
    5.0 Based on 91 Reviews
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    Filter Reviews:
    Pete C.
    United States United States
    Most comfortable boot socks ever!

    I put on my boot socks yesterday for the first time and loved how they felt in my boots and outside of them. In fact, I wore them in the house sans boots all afternoon. They kept my feet warm and comfortable the entire day!

    Jim P.
    United States United States
    Simply the best sock available!

    Due to my multiple hip operations I buy the expedition socks for the cushioning it provides. When I wear any other brand I can really feel the difference.

    Diane M.
    United States United States
    Wonderful warm socks

    These socks fit so nice n there comfortable. My feet were always cold. I love these socks!

    Angela R.
    United States United States

    They hog my feet, keep them warm and feel like a massage. I have skinny, bony feet- they make my shoes fit better. Thanks

    Kathryn G.
    United States United States
    Cushy Comfort

    I am a wildland firefighter and have been for the last 20 years. Prior to discovering FITS I had stuck to Patagonia's heavy duty hike sock, once they no longer made them I tried them ALL! I put in a ton of time hiking tough terrain for work and FITS is my go-to sock. I wear a women's size 7 shoe and found that the Men's medium works best for me.

    Tricia H.
    Again great quality and very

    Again great quality and very comfortable.

    Gregg F.


    Isaac t.
    All day wearing these bad boys

    Awesome socks! Been wearing these for my first Wildland fire season, VERY impressed.



    The Perfect Fit Starts With the Right Size.

    Your sock size shouldn’t be a guessing game. Our socks range from small to double XL, but the best way to know the perfect fit for you is to match your shoe size to the chart on the left. That way, you’ll know the size you select will give you the fit and feel you expect.

    Between sizes? Go with your gut, but rest assured that your socks will still fit great. If you receive your order and find yourself wishing you’d gone up or down a size, just let us know. We’ll happily send you replacements for your preferred size.

    Concerned about laundry mix-ups? All FITS® socks are coordinated by color and size, based on the colors you see on the size chart. So, you won’t have to worry about mixing up your sizes with the other FITS® wearers in your home. (But stray socks mysteriously going missing in the dryer? Unfortunately, we can’t help with that.)

    Questions? Let’s talk.