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EcoSox
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Blue Flame Thermals

$13.00
(18 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.

IF YOU WEAR SHOE SIZE

WomensMens
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...

18 Reviews

  • 5
    Eco Socks thick & fluffy

    Posted by David Apps on Jul 6th 2026

    Funny you should send me this review as I just placed a pair of your cushion black eco socks on. Even though it’s suppose to hit 83 degrees here today; I wear your socks year round! I give them to relatives as Birthday & Christmas gifts and have received nothing but high appreciation!

    Thank you for an outstanding product that tests the time of longevity!

  • 5
    softest socks

    Posted by Patty on Dec 15th 2025

    These are the only ones my husband will wear. He's super picky and these socks are very soft and comfortable.

  • 5
    Blue flame thermals

    Posted by Janet on Nov 25th 2025

    They are great as usual but heavier than I expected.

  • 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
    Cosy

    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
    Thermals

    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.

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