Merino Wool Boot Socks - Heavy Expedition | FITS®

Heavy Expedition - Boot

207 reviews

Heavy Expedition - Boot

207 reviews

Size Guide
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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 knit, 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 207 Reviews
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    Filter Reviews:
    Arthur D.
    United States United States

    ? ?

    These socks are very soft, thick, and comfortable. I plan to buy more. Art Draut

    Roger L.
    United States United States

    Great sock will last while

    Ay Have Over fits Sachs and There Mae Perfect, King Zach, The Expedition Style Best For Long Or overnight hikes. You Cant Go wrong With a pair of fits socks. And let me say they back their warranty 100% even so far as to go and ask you what you’re using the sock for and offering you upgraded socks so that you have the right sock for what you’re using even if the old sock wore out. I’ve had them send me a better pair of socks than the original pair I ordered, great company. Great product. Great service.

    Barry B.
    United States United States

    Heavy Expedition - Boot

    Excellent sock, very good condition after quite a few washings. Very comfortable.

    Tom L.
    United States United States

    The Best Heavy Socks

    These are the best heavy socks money can buy. You will not regret spending your hard earned money on them. If you're shoe size is near the upper limit for the sock size I recommend going to the next sock size up.

    Tom M.
    United States United States

    Heavy Expedition Boot

    I have worked in Mines and Sawmills all my life in all types of climates and conditions.I have a lot of metal in one foot so having warm socks that fit snugly are a necessity! Good people to deal with if you ever have a problem they want to make it right.

    Sarah B.
    United States United States

    Best fit ever, high quality construction

    These hugged my feet as if they were custom made, which is a first! They appear to be very well designed and produced; time will tell!

    Karen P.
    United States United States

    Fits Boot

    Great socks. My favorite for wearing in my snow boots when shoveling. Ensures better fit and warm feet. These are also my favorite socks for wearing to bed in the winter. They keep my often cold feet warm without itchiness of some wool socks.

    Dawn S.
    United States United States

    Love them!!

    Very comfortable


    Sock Sizing
    women and men size chart

    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.)


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    How Do You Determine Sock Size?

    Sock sizes are typically measured in inches, not by your shoe size. So, a sock size 6-8 will comfortably fit someone whose feet are between six and eight inches long. However, at FITS®, we make it easy for you to choose the ideal sock size without having to measure your foot. Simply use our sock size conversion chart based on your shoe size to select the right fit for you. 

    How Do You Measure Your Foot for Socks?

    To measure your foot for socks, measure the length from the heel of your foot to the tip of your longest toe. The measurement in inches correlates to your sock size. For example, if your foot is 10 inches long, a sock size 9-11 should fit you comfortably. At FITS®, you can skip this step and find your sock size based on your shoe size using our conversion chart. 

    What Is the Sock Size Conversion?

    The sock size conversion refers to sock size compared to shoe size. While all companies may vary slightly on which size socks to purchase based on your shoe size, you can always measure your foot to find the right fit for you. 

    What is Sock Size to Shoe Size?

    Because sock sizes are determined by the length of your foot in inches vs. your shoe size, shoe and sock sizes differ. The FITS® sock size to shoe size conversion is as follows:

    Knowing this makes it easy to choose the ideal sock size based on your shoe size without measuring your foot. 

    What Age is Sock Size 9-12?

    Sock sizes typically don’t correlate with age. For kids, age can be a general indicator of what size sock they’ll need, but everyone is different. An adult sock size 9-12 fits anyone whose feet are approximately nine to twelve inches long. For kids’ sock sizing, check with the company to find exact details to ensure your little one gets the perfect fit. 

    Got more questions about finding the perfect sock size for you? Let’s talk.



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