Blue Flame E-Tech Bamboo Thermal Socks

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What Size Do You Need?

Blue Flame E-Tech thermals not only insulate but use the super moisture-wicking properties of bamboo viscose to keep feet drier. While moisture build-up typically defeats most socks' insulative properties, these E-Tech are designed with thick inner loops of cushioning that trap heat and keep your feet warm and dry for hours.  You can feel this sock working when you remove your foot from your footwear and you feel a wave of cool air created from rapid evaporation of moisture.  This sock rates four flames out of four for thermal properties.

  • Bamboo viscose looped thermal pile trap and hold heat.
  • The knitted smooth integrated toe seam stitching reduces friction.
  • Natural moisture-wicking materials help keep feet dry and blister-free.
  • Arch support for comfort to fight foot fatigue.


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

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Sock Materials:

40% Bamboo Viscose / Acrylic / Polyester / Spandex

Why Bamboo Socks?

Bamboo is an ecologically friendly plant to farm. Unlike other materials, bamboo viscose performance attributes are natural, so there is no need for chemical additives or fabric conditioners. Bamboo viscose has a silk-like feel and is ultra-soft against your skin, which reduces friction and makes for really comfortable socks. Learn more...

Blue Flame Thermal Socks Warmth Index

Socks That Will Not Give You Blisters Lifetime Blister Free Guarantee! Learn more...

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

19 Reviews

  • 5
    Great Winter Sock

    Posted by Karl on Aug 9th 2021

    The absolute best sock to keep your feet warm when outside in the cold.

  • 5
    Beyond Outstanding Fit and Comfort!

    Posted by Socks1035! on Mar 24th 2021

    Honestly by far the best sock I have every tried. I am quite particular in the products I choose. This sock caresses every part of the foot perfectly. The ankle portion doesn’t bunch up one bit and remarkably without much of any pressure (and I have larger than average calves).
    The thread also holds up really well, I still wear my first pair regularly thought the winter months. It’s the 3rd year and they have had very little thread loss, most wool socks will barely make it through the season.
    I have tried socks that cost twice as much but don’t compare in comfort or performance.

  • 5
    Best socks ever! Finally.

    Posted by Wendy Diessner on Mar 22nd 2021

    Thickness perfect. Fit perfect. Material perfect. Final review: perfect.

  • 5

    Posted by Amy on Jan 30th 2021

    Thick, cushioned socks. Well made!

  • 5
    Blue flame etech

    Posted by Jim on Jan 27th 2021

    Incredibly comfortable and warm. Makes wearing running shoes in the cold very comfortable. I am about to get my sock drawer reset to almost all ecosox. Every ecosox type I have bought has been nothing but great for comfort and wear.

  • 4
    Blue Flame is hot hot hot

    Posted by Adam Nutting on Dec 26th 2020

    I was honestly not expecting how warm these socks actually keep my feet. Love them and excited to get them out in the woods for winter adventures.

  • 5
    Thermal socks

    Posted by Maria on Dec 22nd 2020

    Very warm and comfortable!

  • 5
    Outstanding Fit and Comfort

    Posted by Unknown on Dec 14th 2020

    I have looked more than most and have not found anything near this fitting and comfortable near this price range.

  • 5

    Posted by Maria on Dec 2nd 2020

    They fit well and are warm and comfortable. I like that these are not made with animal products. Thanks!