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LABOR DAY SALE

5% off eligible gear. Automatically applied at checkout. Ends September 7. Exclusions apply.

Base Layers & Undergarments collection

Base Layers & Undergarments

(17 products)
About Base Layers & Undergarments

Base layers and undergarments help regulate comfort during long field days, cold weather games, camping weekends, and outdoor events. This collection is intended for thermal tops, bottoms, underlayers, and clothing worn under outer gear or uniforms.

Choose base layers by matching temperature, activity level, moisture management, fit, and whether they will be worn under tactical gear, paintball pants, chest rigs, or uniforms. Good layering can make a major difference during long events where weather shifts throughout the day.
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  • G.I. Military Cold Weather M-65 Quilted Field Pant Liner, No, X-Small Short Regular
    📦 Ships Direct

    McGuire Army Navy

    G.I. Military Cold Weather M-65 Quilted Field Pant Liner

    45 available
    $19.99 USD
    View details
  • McGuire Gear Tactical Moisture-Wicking T-Shirt, Small McGuire Gear Tactical Moisture-Wicking T-Shirt, 2 Pack, Medium, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    McGuire Gear Tactical Moisture-Wicking T-Shirt

    131 available
    From $14.99 USD
    View details
  • Gen III Level 1 Silkweight Thermal Undershirt - X-Small Regular
    📦 Ships Direct

    McGuire Army Navy

    Gen III Level 1 Silkweight Thermal Undershirt— X-Small Regular

    1012 available
    $24.99 USD
    View details
  • Poly-Spandex Long John Thermal Bottoms, Medium Regular
    📦 Ships Direct

    McGuire Army Navy

    Poly-Spandex Long John Thermal Bottoms

    189 available
    $18.99 USD
    View details
  • Midweight Polyester Polygon Thermal Bottoms- 7 Oz, Medium Regular Midweight Polyester Polygon Thermal Bottoms- 7 Oz, Medium Long, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    Midweight Polyester Polygon Thermal Bottoms- 7 Oz

    92 available
    From $18.98 USD
    View details
  • Midweight Henley Cotton Thermal Top, Small Regular Midweight Henley Cotton Thermal Top, Large Regular, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    Midweight Henley Cotton Thermal Top

    59 available
    $18.99 USD
    View details
  • ECWCS Gen III Level 2 Thermal Grid Fleece Shirt - Tan 499, SR
    📦 Ships Direct

    McGuire Army Navy

    ECWCS Gen III Level 2 Thermal Grid Fleece Shirt—Tan 499

    112 available
    $39.99 USD
    View details
  • Heavy-Weight Cotton Thermal Bottom- 9 Oz, Medium Regular Heavy-Weight Cotton Thermal Bottom- 9 Oz, Medium Long, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    Heavy-Weight Cotton Thermal Bottom- 9 Oz

    60 available
    $18.99 USD
    View details
  • Midweight Cotton Thermal Bottom - 7 Oz, Medium Regular Midweight Cotton Thermal Bottom - 7 Oz, Medium Long, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    Midweight Cotton Thermal Bottom— 7 Oz

    132 available
    $18.99 USD
    View details
  • Heavy-Weight PolyCotton Bi-Ply Thermal Bottoms - 9 Oz, Medium Regular Heavy-Weight PolyCotton Bi-Ply Thermal Bottoms - 9 Oz, Large Regular, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    Heavy-Weight PolyCotton Bi-Ply Thermal Bottoms— 9 Oz

    45 available
    $18.99 USD
    View details
  • Midweight Cotton Thermal Top - 7 Oz, Small Regular Midweight Cotton Thermal Top - 7 Oz, Medium Regular, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    Midweight Cotton Thermal Top— 7 Oz

    Very low stock (1 available)
    $18.99 USD
    View details
  • Heavy-Weight PolyCotton Bi-Ply Thermal Top - 9 Oz, Medium Regular Heavy-Weight PolyCotton Bi-Ply Thermal Top - 9 Oz, Large Regular, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    Heavy-Weight PolyCotton Bi-Ply Thermal Top—9 Oz

    68 available
    $18.99 USD
    View details
  • Heavy-Weight Cotton Crew Neck Thermal Top -9 Oz, Medium Long Heavy-Weight Cotton Crew Neck Thermal Top -9 Oz, Large Long, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    Heavy-Weight Cotton Crew Neck Thermal Top -9 Oz

    22 available
    $18.99 USD
    View details
  • GI USMC FROG Thermal Top, XL - Quantity Packs in Sand GI USMC FROG Thermal Top, XL - Quantity Packs in Coyote, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    GI USMC FROG Thermal Top, XL— Quantity Packs

    2 colors available

    5472 available
    From $19.99 USD
    View details
  • GI USMC FROG Thermal Bottoms in Sand GI USMC FROG Thermal Bottoms in Sand, alternate view 2
    📦 Ships Direct

    McGuire Army Navy

    GI USMC FROG Thermal Bottoms

    2 colors available

    316 available
    From $9.99 USD
    View details
  • PolyPro ECWCS Thermal Bottoms in Brown
    📦 Ships Direct

    McGuire Army Navy

    PolyPro ECWCS Thermal Bottoms

    1 color available

    2860 available
    $22.99 USD
    View details
  • Gen III Level 1 Poly Thermal Top - Tan 499, X-Small
    📦 Ships Direct

    McGuire Army Navy

    Gen III Level 1 Poly Thermal Top— Tan 499

    37 available
    $18.99 USD
    View details

Base Layer FAQs

What are base layers used for?

Base layers help manage warmth, sweat, and comfort under outer clothing. They are useful during cold weather, long outdoor events, or field days with changing temperatures.

Should base layers fit tight or loose?

Most base layers work best with a close fit so they can manage moisture and layer cleanly under other clothing. Avoid anything so tight that it restricts movement.

Are thermal layers useful for paintball and airsoft?

Yes. Thermal tops and bottoms can help during cold games or overnight events, especially when players are alternating between high activity and downtime.

Base Layers and Undergarments for Field Use

Shop base layers, thermal tops, bottoms, underlayers, and field apparel for cold weather, long events, and outdoor play.

Base layers and undergarments help regulate comfort during long field days, cold weather games, camping weekends, and outdoor events. This collection is intended for thermal tops, bottoms, underlayers, and clothing worn under outer gear or uniforms.Choose base layers by matching temperature, activity level, moisture management, fit, and whether they will be worn under tactical gear, paintball pants, chest rigs, or uniforms. Good layering can make a major difference during long events where weather shifts throughout the day.
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