I never have to worry about getting cold again because of Diamondown.
    - Keith Warren, Executive Producer, The High Road Group
    more testimonials

    Performance base layers thermal underwear by  Diamondown™ is made with a high-tech carbon-based fiber, a revolutionary approach to cold weather under clothes. For thermal wear that works indoors and outdoors, outdoor enthusiasts, hunters, hikers, and fishermen and women will find this comfort management clothing system superior to any other. Diamondown's patented innovative system nearly doubles the thermal resistance of all other insulated gear on the market. We’re especially proud to have filled the gap between extreme outdoor clothing and lack of comfort. This amazing technology is used in our thermal underwearsocksglove liners, and balaclava hoods. The products have been tested with hunters, military officers, skiers and the famous Alaskan Iditarod, exposing the gear to temperatures as low as -50 F, high winds, and extreme usage. They were all astonished by its quality, durability and comfort.

    Shop our thermal wear now.

    2013 R&D 100 Award Winner

    Diamondown is a 2013 R&D 100 Award Winner