Base Layer and Thermal Underwear

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.

  • Indera Mills 800LS Traditional Long John Thermal Long Sleeve Shirt
    I304856
    Regular price
    from $6.99
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    from $6.99
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  • Tru-Spec Cordura Baselayer Crew Neck Shirts
    T301616
    Regular price
    from $19.95
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    from $19.95
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  • Drifire DF4-505TSW Women's Flame Resistant Ultra Lightweight Short Sleeve Tee
    D6001029-2
    Regular price
    from $50.85
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    from $50.85
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  • Drifire DF2-MIL-762-PLP Prime FR Mid-Weight Soft Compression Long Johns
    D304486-3
    Regular price
    from $94.85
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    from $94.85
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  • Drifire DF2-MIL-762-PLS Prime FR Mid-Weight Soft Compression Long Sleeve Tee Shirt
    D304487-2
    Regular price
    from $87.85
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    from $87.85
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  • Drifire DF2-MIL-762-PBB Prime FR Mid-Weight Soft Compression Boxer Brief
    D304485-3
    Regular price
    from $65.85
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    Regular price
    from $65.85
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  • NSA FR Flame Resistant Balaclava (HRC 3- 4.0 cal)
    N304897
    Regular price
    $29.70
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    Regular price
    $29.70
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  • NSA H11 FR Flame Resistant Balaclava (HRC 2 - 4.0 cal)
    N304896
    Regular price
    $21.70
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    $21.70
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  • Chicago Protective Apparel CXA55 CarbonX Active Baselayer Pant (HRC 2 - 8 cal)
    C304963
    Regular price
    from $69.90
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    from $69.90
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  • Chicago Protective Apparel CXA54 CarbonX Active Baselayer Long Sleeve Shirt (HRC 2 - 8 cal)
    C304962
    Regular price
    from $69.90
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    from $69.90
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  • Chicago Protective Apparel CX-55 CarbonX Ultimate Baselayer Pant (HRC 2 - 12.3 cal)
    C304960
    Regular price
    from $78.30
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    from $78.30
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  • Chicago Protective Apparel CX-54 CarbonX Ultimate Baselayer Long Sleeve Shirt (HRC 2 - 12.3 cal)
    C304959
    Regular price
    from $78.30
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    from $78.30
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  • Drifire DF2-CM-446BB Flame Resistant Lightweight Boxer Briefs (HRC 1 - 4.9 cal)
    D304493
    Regular price
    from $31.50
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    from $31.50
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  • Drifire DF2-CM-446LP FR Lightweight Flame Resistant Long Underwear Bottoms (HRC 1 - 4.9 cal)
    D304492
    Regular price
    $54.10
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    $54.10
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  • Drifire DF2-CM-265ALS FR Heavyweight Flame Resistant Long Sleeve Tee Shirt (HRC 2 - 11 cal)
    D304491
    Regular price
    from $89.50
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    from $89.50
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  • Drifire DF2-CM-446LS FR Lightweight Flame Resistant Long Sleeve Tee Shirt (HRC 1 - 4.5 cal)
    D304490
    Regular price
    from $52.90
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    Regular price
    from $52.90
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  • Drifire DF2-CM-446TS FR Lightweight Flame Resistant Short Sleeve Tee Shirt (HRC 1 - 4.5 cal)
    D304489
    Regular price
    from $44.10
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    Regular price
    from $44.10
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  • Drifire DF2-CM-762-PTS FR Prime Flame Resistant Short Sleeve Tee Shirt (HRC 1 - 4.9 cal)
    D301842
    Regular price
    from $64.30
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    Regular price
    from $64.30
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  • Drifire DF2-CM-762-PLS FR Prime Flame Resistant Long Sleeve Tee Shirt (HRC 1 - 4.9 cal)
    D301843
    Regular price
    from $73.50
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    Regular price
    from $73.50
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  • Drifire DF2-CM-762-PLP FR Prime Flame Resistant Long Johns (HRC 1 - 4.9 cal)
    D301853
    Regular price
    from $77.40
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    Regular price
    from $77.40
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  • Drifire DF2-CM-762-PBB FR Prime Flame Resistant Boxer Briefs (HRC 1 - 4.9 cal)
    D301852
    Regular price
    from $56.10
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    Regular price
    from $56.10
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  • Drifire DF2-793LS FR Strongknit Prime Flame Resistant Long Sleeve T-Shirt (HRC 2 - 10 cal)
    D304484
    Regular price
    from $83.90
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    Regular price
    from $83.90
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  • Indera Mills 890LS Expedition Weight Cotton Raschel Knit Long John Thermal Long Sleeve Shirt
    I304894
    Regular price
    from $14.99
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    Regular price
    from $14.99
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  • Indera Mills 890DR Expedition Weight Cotton Raschel Knit Long John Thermal Drawers
    I304895
    Regular price
    from $14.99
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    Regular price
    from $14.99
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  • Indera Mills 822DR Maximum Weight Long John Thermal Drawers
    I304893
    Regular price
    from $12.99
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    Regular price
    from $12.99
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  • Indera Mills 822LS Maximum Weight Long John Thermal Long Sleeve Shirt
    I304892
    Regular price
    from $12.99
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    Regular price
    from $12.99
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  • Indera Mills 880LS Raschel Knit Heavyweight Long John Thermal Long Sleeve Shirt
    I304891
    Regular price
    from $11.99
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    Regular price
    from $11.99
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  • Indera Mills 880DR Raschel Knit Heavyweight Long John Thermal Drawers
    I304890
    Regular price
    from $11.99
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    from $11.99
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  • Indera Mills 21DR Polypropylene Long John Thermal Drawers
    I304861
    Regular price
    from $15.99
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    Regular price
    from $15.99
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  • Indera Mills 21LS Polypropylene Long John Thermal Long Sleeve Shirt
    I304860
    Regular price
    from $15.99
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    Regular price
    from $15.99
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  • Indera Mills 839DR Cotton Heavyweight Long John Thermal Drawers
    I304859
    Regular price
    from $9.99
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    Regular price
    from $9.99
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  • Indera Mills 839LS Cotton Heavyweight Long John Thermal Long Sleeve Shirt
    I304858
    Regular price
    from $9.99
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    Regular price
    from $9.99
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  • Indera Mills 800DR Traditional Long John Thermal Drawers
    I304857
    Regular price
    from $6.99
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    from $6.99
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  • NSA FR Control 2.0 U52FKSR Navy Blue Flame Resistant Long Underwear Bottoms (HRC 1 - 4.0 cal)
    N3011106
    Regular price
    $80.70
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    Regular price
    $80.70
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  • NSA FR Control 2.0 H85FK Navy Blue Flame Resistant Balaclava (HRC 1 - 4.0 cal)
    N3011105
    Regular price
    $27.40
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    Regular price
    $27.40
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  • NSA FR Control 2.0 C52-LS Flame Resistant Long Sleeve T-Shirt (HRC 1 - 4.0 cal)
    N3011102
    Regular price
    $69.70
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    $69.70
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  • NSA FR Control 2.0 C52-SS Flame Resistant Short Sleeve T-Shirt (HRC 1 - 4.0 cal)
    N3011101
    Regular price
    $62.70
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    Regular price
    $62.70
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  • Massif MPNT00004 Flame Resistant Flamestretch Pants
    M304726
    Regular price
    $209.99
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    Regular price
    $209.99
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  • Bates E11956970 Tactical Uniform Low Cut Socks - White or Black
    B200277
    Regular price
    $8.95
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    Regular price
    $8.95
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  • Drifire DF2-762-SB Women's Prime FR Mid-Weight Soft Compression Sports Bra (HRC 1 - 4.4 cal)
    D304496
    Regular price
    from $59.85
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    Regular price
    from $59.85
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  • Drifire DF2-245LS Flame Resistant Heavyweight Base Layer Long Sleeve Shirt
    D3011016
    Regular price
    from $92.85
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    Regular price
    from $92.85
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  • Drifire DF2-762HNG Flame Resistant Hot Weather Neck Gaiter
    D3011011
    Regular price
    $24.40
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    Regular price
    $24.40
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  • Drifire DF2-762CNG Flame Resistant Cold Weather Neck Gaiter
    D3011010
    Regular price
    $41.00
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    Regular price
    $41.00
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  • UJF A14F102 Fortiflame Baselayer Level 4 Quarter Zip Top
    U304642
    Regular price
    $85.95
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    $85.95
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  • Bates E11917170 Utility Crew Socks (2 pack) - Black
    B200766
    Regular price
    $15.95
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    Regular price
    $15.95
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  • UJF D11H402 Fortiflame Baselayer Level 1 Flame Resistant Cold Weather Balaclava
    U304595
    Regular price
    $33.44
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    Regular price
    $33.44
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  • UJF D11G402 Fortiflame Baselayer Level 1 Flame Resistant Hot Weather Balaclava
    U304594
    Regular price
    $24.62
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    $24.62
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  • UJF D11H403 Fortiflame Baselayer Level 1 Flame Resistant Cold Weather Neck Gaiter
    U304593
    Regular price
    $21.09
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    $21.09
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