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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

  • New video! What makes Heat Holders® So Warm?

    Watch Toestee the Dragon and his friends explain the special 3 step manufacturing process of what makes Heat Holders® so warm! One of the many questions we get asked from our customers is “What makes Heat Holders® so warm?” The... Read more →