Blue Flame Thermals

(10 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...

10 Reviews

  • 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!!!!!

  • 5

    Posted by Lisa Timmer on May 20th 2019

    i haven't worn these yet because its not cold out but these are the real deal - they are super thick and look like they'll be perfect for extreme cold

  • 5
    blue flame thermal socks

    Posted by mike hannan on Feb 12th 2018

    I'm enjoying the blue flame thermal socks I purchased. Not as warm as wool for these cold Minnesota winters, but still a very good sock for the money. If you don't want wool socks then these would be very good socks to purchase.

  • 5
    Blue Thermal Socks

    Posted by Eileen Holfeld on Jan 22nd 2018

    Ordered my husband a couple of pairs for Christmas and he loved them so much, I ordered more for him and also ordered myself a pair and love them as well.

    EcoSox are tops in our book.

  • 5
    Heavy socks

    Posted by Pat Isherwood on Jan 9th 2018

    I sent them to my daughter where it is very cold & she said she loved them but they didn't fit in her shoes because she has orthotics but the good news she wears them around house & keeps her feet toasty.

  • 5
    Blue Thermal Socks

    Posted by Rose on Dec 8th 2017

    These are really nice socks at a great price. Soft, cozy, and very warm. Wore them today with temps in the 20s and windchill temp in the teens. Kept my feet nice and toasty. My feet fell "toes over heels" in love! Buying more.