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All Thermal Underwear

The phenomenal success of our Heat Holders® socks has led to the development of additional Heat Holders® products. Our Thermal Underwear, available in various colors and sizes, will keep you warm on those cold winter days. And for ultimate thermal performance, try our Microfleece Base Layers, Tog rated at 0.61! Choose a style to buy now or narrow your selection to Men's or Women's styles.

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Latest Blog Article

  • ULTRA LITE™'s Are Here!

    Are you in search of a sock that is lightweight, will fit into your tighter shoes comfortably and will keep your feet warm and toasty? Introducing Heat Holders® ULTRA LITE™ – the sock everyone has been waiting for!   The ULTRA LITE™'s provide... Read more →