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Merino Thermal OTC Sock

4.761904761904762 out of 5 stars
42 Reviews


Size Chart


Why We Like The Simms Merino Thermal OTC Sock

The merino wool blend is soft against skin while naturally wicking moisture, resisting odor, and insulating us even if it gets wet. The over-the-calf length keeps us warmer under waders in knee deep water while also protecting our calves from abrasive rocks and rubbing wading boots.


  • Wader-friendly merino wool socks, Merino wool regulates moisture while it insulates
  • Nylon and Lycra Spandex add durability and stretch
  • Reinforced heel and toe for added durability
  • Made in USA
  • Item #SMMF08R
81% merino wool, 18% nylon, 1% Infinium spandex
fly fishing
Manufacturer Warranty

Overall Rating

5 based on 42 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 1 reviews
3 Stars - 2 reviews
4 Stars - 3 reviews
5 Stars - 36 reviews

What do you think about this product?


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3 out of 5 stars

January 17, 2024

Warm but not perfect

Received these socks as a Christmas gift. Comfortable and warm, however the seems by the toe are starting to unravel.

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Originally reviewed on

5 out of 5 stars

January 17, 2024

Great sock for the cold

Bought as a gift for my son and he loves them he’s already worn them in snowy trout fishing


Originally reviewed on

5 out of 5 stars

January 7, 2024

I'm a believer!

I've never been one who cared much for wool socks. I've always found they were too bulky and made my feet sweat. But, I am a believer in these Simms over the calf socks. Santa brought me a pair of these and I recently wore them on a wade trip. Air temp was 32 degrees and water temp was 40. My feet and lower legs were comfy, warm, and dry all day. And, best sweaty feet! Neoprene boots of my waders slipped on and off with no struggle. You gotta get you a pair of these! I found they run a little small in the calf so size up when you purchase! Thanks, Santa!


Originally reviewed on

4 out of 5 stars

January 5, 2024

A very nice sock!

The socks are thick and warm. The Merino wool seems to keep odor down. The cut of the OTC sock causes the top to land in the middle of of my calf which is a little constricting, but overall great.


Originally reviewed on

5 out of 5 stars

January 3, 2024

Winter trout fishing essential

Super warm, comfortable, and having the high calf is really nice. Tumble dry low or air dry for maximum life


Originally reviewed on

5 out of 5 stars

December 18, 2023


The warmest socks I've ever owned.. I even bout several more for hunting .. Highly recommend them


Originally reviewed on

5 out of 5 stars

December 11, 2023

Great socks. Keeps my feet warm fishing in the winter


Originally reviewed on

5 out of 5 stars

December 8, 2023

None Better…

My first choice for socks of this type…none better!


Originally reviewed on

5 out of 5 stars

December 4, 2023

Warm Socks!

Thick and warm. I wear these under my waders, wading through mud in cold water. They definitely keep your feet warm throughout the day. A noticeable difference from my old socks. Great fit as well


Originally reviewed on

5 out of 5 stars

December 1, 2023

Runs true to size. Comfortable to wear and added the right amount of warmth under the simms deck book ro fish comfortably in 30 degree temprature


Originally reviewed on