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Base Layer and Thermal Underwear

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Flame Resistant Base Layer Apparel and Thermal Underwear

Flame resistant underwear and FR base layer clothing provide a last line of defense against electric arc flash and flash fire hazards. Many people have been saved by wearing FR base layer apparel from fires that burned through their outer protective garments. There are two types of FR fabric available for base layer clothing – inherently FR and treated FR. Fabric that is inherently FR, like Nomex, is flame-resistant for life, which means that no matter how many times it is laundered or how long it is worn, the material will always remain flame-resistant. Treated FR fabrics have a flame resistant chemical applied to them that makes the fabric flame resistant; however, normal wear, laundering, abrasion, and UV exposure gradually reduces the protective value of the garment over time.

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  • Drifire DF2-446BB Flame Resistant Lightweight Boxer Briefs (HRC 1 - 4.5 cal)
    D304493-01
    from $54.20
    $62.70
    from $54.20
    Sold out
  • Drifire DF2-446LP FR Lightweight Flame Resistant Long Underwear Bottoms (HRC 1 - 4.9 cal)
    D304492-01
    from $84.60
    $218.15
    from $84.60
    Sold out
  • Drifire DF2-CM-265ALS FR Heavyweight Flame Resistant Long Sleeve Tee Shirt (HRC 2 - 11 cal)
    D304491-01
    from $134.10
    $149.00
    from $134.10
    Sold out
  • Drifire DF2-CM-446LS FR Lightweight Flame Resistant Long Sleeve Tee Shirt (HRC 1 - 4.5 cal)
    D304490-01
    from $81.70
    $86.00
    from $81.70
    Sold out
  • Drifire DF2-CM-446TS FR Lightweight Flame Resistant Short Sleeve Tee Shirt (HRC 1 - 4.5 cal)
    D304489-01
    from $67.50
    $71.00
    from $67.50
    Sold out
  • Drifire DF2-CM-762-PTS FR Prime Flame Resistant Short Sleeve Tee Shirt (HRC 1 - 4.9 cal)
    D301842-01
    from $94.50
    $115.50
    from $94.50
    Sold out
  • Drifire DF2-CM-762-PLS FR Prime Flame Resistant Long Sleeve Tee Shirt (HRC 1 - 4.9 cal)
    D301843-01
    from $108.90
    $121.00
    from $108.90
    Sold out
  • Drifire DF2-CM-762-PLP FR Prime Flame Resistant Long Johns (HRC 1 - 4.9 cal)
    D301853-01
    from $113.40
    $126.00
    from $113.40
    Sold out
  • Drifire DF2-CM-762-PBB FR Prime Flame Resistant Boxer Briefs (HRC 1 - 4.9 cal)
    D301852-01
    from $90.30
    $139.09
    from $90.30
    Sold out
  • Drifire U52FKSR Navy Blue Flame Resistant Long Underwear Bottoms (HRC 1 - 4.0 cal)
    N3011106
    from $121.50
    $148.50
    from $121.50
    Sold out
  • Drifire H85FK Navy Blue Flame Resistant Balaclava (HRC 1 - 4.0 cal)
    N3011105
    $43.70
    $46.00
    $43.70
    Sold out
  • Drifire C52 Flame Resistant Long Sleeve T-Shirt - NSA Style C52FKSRLS C52JKSRLS (HRC 1 - 4.0 cal)
    N3011102
    from $105.30
    $117.00
    from $105.30
    Sold out
  • Drifire C52 Flame Resistant Short Sleeve T-Shirt - NSA Style C52FKSR C52JKSR (HRC 1 - 4.0 cal)
    N3011101
    from $94.50
    $153.73
    from $94.50
    Sold out