Blue Flame Thermals

(15 reviews) Write a Review

What Size Do You Need?

The original Blue Flame thermal sock is a thick, heavyweight sock. The brushed acrylic construction has ultra-soft insulation in the inside that retains 600% more heat than cotton — this sock rates four flames out of four for thermal properties.

  • 600% warmer than cotton.
  • A soft and plush half-inch thick sock.
  • Insulated brush acrylic construction trap and hold heat.


You Need Sock Size
6-10.5 5-9 M
10.5-14 9-12.5 L

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Sock Materials:

94% Acrylic / Polyester / Rubber

Blue Flame Thermal Socks Warmth Index

Socks You Are Guaranteed To Love 30-Day Money-Back Guarantee for Online Purchases. Learn more...

15 Reviews

  • 5
    These socks are SO warm!

    Posted by Marcia Heifner on Jul 7th 2023

    I love these socks! I have actually mended some of my older Blue Flame socks because of swelling in my ankle and foot — so the looser tops are just right. I hope these socks are available for a long time! :)

  • 5

    Posted by Margie Riffle on Dec 6th 2022

    My feet stay warm and dry. I love these socks !

  • 5
    Love lounging in my thermals

    Posted by Margie Riffle on Dec 5th 2022

    My feet stay dry and warm and I still wonder how is that possible !! I don’t have skinny calves and they are a bit snug but I fold them over and enjoy my newfound treasure!

  • 5

    Posted by Judy Hallman on Dec 20th 2021

    These are wonderfully soft, thick, and warm. Just what I was looking for as a bed sock.

  • 5
    Awesome Sox

    Posted by Margie on Nov 15th 2021

    Love these socks ! Haven’t tried them with shoes or boots yet thinking they going to be tight because of the thickness but
    worth every penny. With slippers or without my feet were toasty ~
    not sweaty just perfect.

  • 4
    Warm and Thick

    Posted by Karl on Aug 9th 2021

    I like these socks, but they are so thick that I use more like slippers around the house versus trying to shove by boot over them.

  • 5
    As Advertised, will buy again

    Posted by Gary Hinz on Dec 1st 2020

    Got mine primarily for sleeping, feet get cold at night. Very satisfied and extremely comfortable. Will buy more for wearing with my boots.

  • 5
    Blue Flames

    Posted by Candy Weaver on Apr 13th 2020

    These are the greatest socks! My Dad is 93 and this is now the only socks he wears! He wears them all year long, says they are warm or cool, depending on the weather. He has 10 pair, and I'm ordering that many more! He loves them. That's a good review right there!

  • 5
    Thermal Socks

    Posted by David on Jan 10th 2020

    Without exaggeration, your socks are by far the most phenomenal feeling Socks in this beautiful planet!
    I not only purchase them for myself ~ but my family back in Minnesota and Wisconsin!
    In addition, they easily slip on and off - for those whom have a challenge at this process - it's a real breeze!

    Many many thanks!!!!!