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Women's Heavy Expedition - Boot

7 reviews
Size Guide

The ultimate combination: Merino wool for cold weather insulation and the performance that comes from a perfect fit. There is no other heavy weight 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. Now available in more colors just for you!

  • Heavyweight full foot cushioning for warmth and protection.
  • Durable nylon exterior for extended wear.
  • Boot height rises just below the calf.
Merino Wool 74%
Nylon 13%
Acrylic 8%
Polyester 3%
Lycra 2%



Customer Reviews
4.9 Based on 7 Reviews
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Debra g.
My Go-To Winter Sock

I've been wearing these thick, absorbent socks in my winter boots for years. I live in a northern climate with long, cold winters, and I hate cold feet! These socks, and a good pair of boots, are the answer for that!

Alejandra V.
Love them!!

I have excessive sweating on my feet and these socks have helped me sooo much! My shoes AND feet don’t smell anymore and I’m not embarrassed to take off my shoes in front of people. I wish I would have known about these socks a long ago. It has changed my life though! Never going back to cotton or any other sock! I’m in the academy for border patrol right now so they absorb the sweat very well! We march like crazy and the boots are uncomfortable but these nice comfy socks provide a bit more of relaxation.

Warm and comfy

I LOVE the fit and how warm & comfy these are.

Tara C.
Great sock!

I've had FITS socks before, but found they wore out too fast. I really like this one, so far. It's warm, snug, comfortable, and provides great support. My only complaint is that my toes still seem to get a bit cold.

Cathy S.
These socks are perfect on

These socks are perfect on this cold, snowy day in Colorado !! My feet are comfortable, warm & dry!

Backpacking socks

Love these socks, they have a nice foot cushion and are thick, it’s hard to find thick socks anymore with all the light and fast boots. They feel like walking on a cloud!!

Michele A.
great socks

So comfy and sturdy. I love these socks.



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.