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Klim Mammoth Socks

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Klim Mammoth Technical Socks

The Mammoth Sock is Klim's warmest and thickest technical sock designed to enhance the performance of GORE-TEX boots by wicking moisture away from the skin allowing the foot to stay warm and dry even in the harshest environments.


  • 100% terry construction for added warmth and padded comfort
  • High thermal retention value to help hold heat in
  • Above calf design
  • Ankle support stretch band to help keep sock in position, no slipping or bunching
  • Arch support stretch band to help keep sock in position, no slipping or bunching
  • Patterned bend and regular knit at front mid ankle to help prevent bunching
  • Above calf height for warmth and comfort
  • Nylon reinforced toe, heel and sole for ultimate durability
  • 43% merino wool, 40% acrylic, 13% lycra, 4% polyamide

Note: Use of a technical sock is required to obtain the full functionality of Gore-Tex boots

Klim Men's Sock Sizing

Sock Size Shoe Size
SM 4 - 6
MD 7 - 9
LG 10 - 12


Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

How To Measure

FT Feet What size shoe do you wear?
Product Style RevZilla Item # Manufacturer Product # Availability
Black / SM 970309 6005-001-120-000 In Stock: Ships within 24 hours
Black / MD 970310 6005-001-130-000 In Stock: Ships within 24 hours
Black / LG 970311 6005-001-140-000 In Stock: Ships within 24 hours


Orders $39.99 and over qualify for our fast free shipping offer. Click Here for FREE Shipping Terms and Conditions.

Please see our International Orders page for orders shipping outside the US.

We show real-time availability on this product page when you select the size/color item you want.  Most items will ship the same business day an order is placed,however if an item requires additional processing time a message will be shown indicating such.

See our full Shipping Policy for further details.


If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

Write a Product Review for a chance to win our monthly $100 giveaways.
Klim Mammoth Socks 5 5 5 5
Can't wait for the cold weather! Living in Minneapolis means riding in cold temps. 25 degrees is the lowest I'll ride in, and it looks like these socks will be the best ever. Thick, soft, and they'll stay up on my legs (hate it when knee high socks fall down). Looking forward to the first below freezing ride! July 28, 2016
STAY COSY THIS WINTER IN THESE INCREDIBLY WARM FEATS OF FABRIC ENGINEERING Thanks to the Terry construction, the Klim Mammoth socks are likely the warmest socks available on the market. Luxuriously thick, they are great when worn with Gore-Tex boots (or without for that matter) to wick away the moisture, however, are just as much a godsend when your feet are particularly nesh like mine, suffering from the cold when temperatures drop. I don’t care where I am, how stunning the scenery is—if the cold starts to burrow through my feet like a worm, then I can’t concentrate on much else. Blocks of ice for feet are about as much fun as a funeral. Stay cosy this winter in these incredibly warm feats of fabric engineering. January 16, 2016
Very very warm The fit is great, very soft, very thick, very warm,very comfortable to wear all day in steel toed boots and my riding boots, I would buy this product again ! April 5, 2015
Excellent warm sock, runs large These are nice, thick, comfortable, WARM socks. If you're riding in cold weather and have a little room to spare inside your boots, you won't regret getting these. For sizing, guidance shown on other web sites is SM = 4-6, MD = 7-10, LG = 11-14. However, I'm a 6-ft 240-lb gentleman with shoe size 11, and I found the Medium fits me with room to spare. They pull up to just below the knee, and would probably fit a size 12 foot just fine. December 8, 2014
Great Thick Socks These socks are very thick and warm. Riding in 70 degree weather was not too warm. Riding in 40 degree was not too cold. October 28, 2014
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Have a functionality, fit, or otherwise product-specific question about the Klim Mammoth Socks? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.