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Base Layers & Undergarments

(📦 17 products available)

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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  • 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

    Regular priceFrom $14.99 USD
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  • 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
    Regular price $24.99 USD
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  • Poly-Spandex Long John Thermal Bottoms, Medium Regular
    📦 Ships Direct

    McGuire Army Navy

    Poly-Spandex Long John Thermal Bottoms

    Regular price $18.99 USD
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  • 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

    Regular priceFrom $18.98 USD
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  • 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

    Regular price $18.99 USD
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  • 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

    Regular price $39.99 USD
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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

    Regular price $19.99 USD
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  • 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

    Regular price $18.99 USD
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  • 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

    Regular price $18.99 USD
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  • 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

    Regular price $18.99 USD
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  • 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

    Regular price $18.99 USD
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  • 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

    Regular price $18.99 USD
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  • 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

    Regular price $18.99 USD
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  • 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

    Regular priceFrom $19.99 USD
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  • 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

    Regular priceFrom $9.99 USD
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  • PolyPro ECWCS Thermal Bottoms in Brown
    📦 Ships Direct

    McGuire Army Navy

    PolyPro ECWCS Thermal Bottoms

    🎨 1 color available

    Regular price $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

    Regular price $18.99 USD
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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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