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Thermal Base Layer

(19 products)

Thermal base layers trap body heat and wick sweat away from your skin – the difference between staying warm through a shift or shivering in damp clothing. Worn directly against your body, these tops form the foundation of any cold-weather layering system for outdoor work and freezer environments.

Lightweight (150-200gsm) suits moderately cold days and high-activity roles where you're generating heat. Midweight (200-260gsm) covers most winter work down to freezing. Heavyweight (260gsm+) handles extreme cold or static roles in freezers.

Merino Wool vs Synthetic

Merino regulates temperature naturally and resists odour for multi-day wear – but costs more and dries slower. Synthetic polyester base layers dry fast, cost less, and handle rough treatment, though they don't match merino's odour control.

This collection includes long sleeve thermal tops for full arm coverage, short sleeve vests for layering without bulk, and crew neck styles in cuts for men, women, and kids. Pair with thermal insulated gloves and thermal balaclavas for complete extremity protection, or layer under thermal workwear for maximum cold defence.

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  • Portwest

    Portwest Merino Wool Leggings Thermal Baselayer Cold Weather Protection

    WWB181

    Regular price From £30.75 exc VAT £36.90 inc VAT
    • 50% Merino Wool Blend
    • Moisture-Wicking
    • Flat-Locked Seams
    Thermal
    Thermal
    Breathable
    Breathable
    Sizes: S - 2XL
    View details
  • Portwest

    Portwest B151 Base Pro Antibacterial Thermal Leggings Moisture-Wicking

    WWB151

    Regular price From £11.40 exc VAT £13.68 inc VAT
    • Antibacterial Silver Ion Treatment
    • Moisture-Wicking Technology
    • Thermal Protection Layer
    Thermal
    Thermal
    Breathable
    Breathable
    Sizes: S - 2XL
    View details
  • Portwest

    Portwest B153 Base Pro Antibacterial Thermal Base Layer Top

    WWB153

    Regular price From £11.40 exc VAT £13.68 inc VAT
    • Silver Ion Technology
    • Moisture-Wicking Fabric
    • Year-Round Comfort
    Thermal
    Thermal
    Breathable
    Breathable
    Sizes: S - 2XL
    View details
  • Beeswift

    Thermal Vest Short Sleeve Polyester Viscose Base Layer

    WWTHVSS

    Regular price From £4.89 exc VAT £5.87 inc VAT
    • Thermal Insulation
    • Breathable Fabric
    • Close Body Fit
    Thermal
    Thermal
    Breathable
    Breathable
    Sizes: S - 3XL
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  • Beeswift

    Thermal Vest Long Sleeve Polyester Viscose Base Layer

    WWTHVLS

    Regular price From £4.89 exc VAT £5.87 inc VAT
    • Soft Fabric Blend
    • Close-Fit Design
    • Full Range Movement
    Thermal
    Thermal
    Breathable
    Breathable
    -10
    -10
    Sizes: S - 3XL
    View details
  • Beeswift

    Thermal Long John Base Layer Brushed Polyester Winter Underwear

    WWTHLJ

    Regular price From £4.65 exc VAT £5.58 inc VAT
    • High Thermal Efficiency
    • Soft Brushed Finish
    • Close-to-Body Fit
    Thermal
    Thermal
    Breathable
    Breathable
    -10
    -10
    Sizes: S - 3XL
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  • Pulsar

    Pulsar Blizzard Women's Thermal Short Sleeve Top White Base Layer

    WWBZ1551

    Regular price From £21.59 exc VAT £25.91 inc VAT
    • VILOFT® Technology
    • Flat-Locked Seams
    • Moisture-Wicking Performance
    Thermal
    Thermal
    Breathable
    Breathable
    -10
    -10
    Sizes: 8 - 18
    View details
  • Pulsar

    Pulsar Women's White Thermal Top VILOFT® Base Layer For Freezing Temperatures

    WWBZ1550

    Regular price From £22.49 exc VAT £26.99 inc VAT
    • VILOFT® Thermal Technology
    • Moisture-Wicking Performance
    • Close-Fitting Base Layer
    Thermal
    Thermal
    Breathable
    Breathable
    -10
    -10
    Sizes: 8 - 18
    View details
  • Pulsar

    Pulsar Women's White Thermal Base Layer Pants Cold Weather Insulation

    WWBZ1552

    Regular price From £23.39 exc VAT £28.07 inc VAT
    • VILOFT® Technology
    • Moisture-Wicking Performance
    • Flat-Locked Seams
    Thermal
    Thermal
    Breathable
    Breathable
    -10
    -10
    Sizes: 8 - 18
    View details
  • Pulsar

    Pulsar Protect FR Long Sleeve Base Layer Inherent Flame Retardant Top

    WWXFRC101

    Regular price From £26.99 exc VAT £32.39 inc VAT
    • Inherent Flame Retardance
    • Flatlock Stitch Construction
    • Knitted Cuffs
    EN ISO 11612
    EN ISO 11612
    Thermal
    Thermal
    Breathable
    Breathable
    Sizes: S - 3XL
    View details
  • Pulsar

    Pulsar Protect FR Long Pants Inherently Flame Retardant Base Layer

    WWXFRC103

    Regular price From £26.99 exc VAT £32.39 inc VAT
    • Inherent Flame Retardant
    • Flat Lock Stitching
    • Knitted Ankle Cuffs
    EN ISO 11612
    EN ISO 11612
    Thermal
    Thermal
    Breathable
    Breathable
    Sizes: S - 3XL
    View details
  • Pulsar

    Pulsar Protect Arc Long Sleeve Base Layer Class 1 Flame Retardant Top

    WWXARC01

    Regular price From £43.19 exc VAT £51.83 inc VAT
    • ATPV 8.6 Cal/cm²
    • IEC 61482-2 Class 1
    • Anti-Static Protection
    IEC 61482
    IEC 61482
    EN 1149
    EN 1149
    EN ISO 11612
    EN ISO 11612
    Breathable
    Breathable
    Sizes: L - 3XL
    View details
  • Pulsar

    Pulsar Protect Arc Long Pants Flame Retardant Anti-Static Base Layer

    WWXARC03

    Regular price From £43.19 exc VAT £51.83 inc VAT
    • ATPV 8.6 CAL/CM²
    • Inherent Flame Retardant
    • Anti-Static Properties
    IEC 61482
    IEC 61482
    EN 1149
    EN 1149
    EN ISO 11612
    EN ISO 11612
    Breathable
    Breathable
    Sizes: L - 3XL
    View details
  • Pulsar

    Pulsar Blizzard Thermal Short Sleeve Top VILOFT Base Layer For Extreme Cold

    WWBZ1502

    Regular price From £21.59 exc VAT £25.91 inc VAT
    • Exceptional Thermal Performance
    • Close-Fitting Base Layer
    • VILOFT Blend Fabric
    Thermal
    Thermal
    Breathable
    Breathable
    -10
    -10
    Sizes: S - 3XL
    View details
  • Pulsar

    Pulsar Blizzard Thermal Long Sleeve Top Navy VILOFT Insulation Base Layer

    WWBZ1501

    Regular price From £22.49 exc VAT £26.99 inc VAT
    • VILOFT Fiber Technology
    • Flat-Locked Seams
    • Moisture-Wicking Performance
    Thermal
    Thermal
    Breathable
    Breathable
    Sizes: S - 3XL
    View details
  • Pulsar

    Pulsar Blizzard Thermal Base Layer Trousers Navy VILOFT Cold Weather

    WWBZ1503

    Regular price From £23.39 exc VAT £28.07 inc VAT
    • VILOFT® Technology
    • Moisture Wicking
    • Flat-Locked Seams
    Thermal
    Thermal
    Breathable
    Breathable
    -10
    -10
    Sizes: S - 3XL
    View details
  • Portwest

    Portwest Merino Wool Baselayer Top 1/4 Zip Thermal Protection

    WWB184

    Regular price From £37.89 exc VAT £45.47 inc VAT
    • Moisture Wicking Performance
    • Antimicrobial Odour Control
    • Flat Lock Seam Comfort
    Thermal
    Thermal
    Breathable
    Breathable
    Sizes: S - 2XL
    View details
  • Portwest

    Portwest Merino Wool Crew Neck Shirt Long Sleeve Base Layer For Work

    WWB183

    Regular price From £33.60 exc VAT £40.32 inc VAT
    • Natural Moisture Wicking
    • Antimicrobial Odour Control
    • Flat-Locked Seams
    Thermal
    Thermal
    Breathable
    Breathable
    Sizes: S - 2XL
    View details
  • Delta Plus

    Delta Plus KOLDYTOP Thermal Base Layer Long Sleeve Coolmax Top

    WWKOLDYT

    Regular price From £18.90 exc VAT £22.68 inc VAT
    • Coolmax Moisture-Wicking
    • Thermal Insulation
    • Breathable Construction
    Breathable
    Breathable
    Thermal
    Thermal
    Sizes: S - 3XL
    View details
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