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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 DF4-505TSW Women
    D6001029-2
    from $57.00
    $60.00
    from $57.00
    Sold out
  • Drifire DF2-MIL-762-PBB Prime FR Mid-Weight Soft Compression Boxer Brief
    D304485-3
    from $74.10
    $78.00
    from $74.10
    Sold out
  • Drifire DF2-762-SB Women
    D304496
    from $64.60
    $68.00
    from $64.60
    Sold out
  • Enespro H11RY Lightweight Ultrasoft Flame Resistant Balaclava (HRC 2 - 12 cal)
    N304896
    $34.20
    $36.00
    $34.20
    Sold out
  • 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-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
  • Enespro H11RV Heavyweight Flame Resistant Balaclava (HRC 3 - 25 cal)
    N304897
    $47.50
    $50.00
    $47.50
    Sold out
  • Drifire H85FK Navy Blue Flame Resistant Balaclava (HRC 1 - 4.0 cal)
    N3011105
    $43.70
    $46.00
    $43.70
    Sold out
  • Drifire DF2-762CNG Flame Resistant Cold Weather Neck Gaiter
    D3011010
    $47.50
    $50.00
    $47.50
    Sold out
  • UJF D11H402 Fortiflame Baselayer Level 1 Flame Resistant Cold Weather Balaclava
    U304595
    $32.29
    $43.06
    $32.29
    Sold out
  • UJF A14F200 Fortiflame Baselayer Level 4 Flame Resistant Long Pants with Fly
    U304591
    $74.82
    $99.76
    $74.82
    Sold out
  • UJF A13D200 Fortiflame Baselayer Level 3 Flame Resistant Long Pants with Fly
    U304589
    $59.41
    $79.21
    $59.41
    Sold out
  • UJF A13D101 Fortiflame Baselayer Level 3 Flame Resistant Long Sleeve Crew Shirt
    U304588
    $59.72
    $79.63
    $59.72
    Sold out
  • UJF A11C200 Fortiflame Baselayer Level 2 Flame Resistant Long Pants with Fly
    U304568
    $53.84
    $71.79
    $53.84
    Sold out
  • UJF A11C101 Fortiflame Baselayer Level 2 Flame Resistant Long Sleeve Crew Shirt
    U304567
    $54.16
    $72.21
    $54.16
    Sold out
  • UJF A11B300 Fortiflame Baselayer Level 1 Flame Resistant Boxer Shorts with Fly
    U304564
    $43.17
    $57.55
    $43.17
    Sold out
  • UJF A11B100 Fortiflame Baselayer Level 1 Flame Resistant Short Sleeve Crew Shirt
    U304563
    $43.17
    $57.55
    $43.17
    Sold out
  • UJF A11B200 Fortiflame Layer I Flame Resistant Long Pants with Fly
    U304562
    $47.78
    $63.71
    $47.78
    Sold out
  • UJF A11B101 Fortiflame Baselayer Level 1 Flame Resistant Long Sleeve Crew Shirt
    U304561
    $47.78
    $63.71
    $47.78
    Sold out
  • Drifire DF2-762CB Flame Resistant Heavyweight Cold Weather Balaclava
    D3011027
    $59.85
    $63.00
    $59.85
    Sold out
  • Drifire DF4-505LS Flame Resistant Ultra Lightweight Long Sleeve Tee Shirt
    D3011020
    from $68.40
    $72.00
    from $68.40
    Sold out
  • Drifire DF4-505LP Flame Resistant Ultra-Lightweight Long John Style Pants
    D3011021-2
    from $73.15
    $77.00
    from $73.15
    Sold out
  • Drifire DF4-505TS Flame Resistant Ultra Lightweight Short Sleeve Tee
    D3011019-2
    from $57.00
    $60.00
    from $57.00
    Sold out
  • Drifire DF2-762HB Flame Resistant Hot Weather Balaclava
    D3011015
    $38.95
    $41.00
    $38.95
    Sold out
  • Drifire DF4-505BB Ultra-Lightweight Flame Resistant Boxer Briefs
    D3011022
    from $55.10
    $58.00
    from $55.10
    Sold out
  • Indera Mills 860US/T860US/865US/T865US 100% Cotton Thermal Unionsuit
    E304875
    from $29.99
    from $29.99
    Sold out