Portwest FB31 Structural Fire Firefighter Trousers

  • Trousers conform with highest firefighting protective certifications
  • Ideal for extremely high temperature structural fires
  • Moisture barrier helps release your body heat and prevents overheating
  • Side elastic for maximum freedom of movement
Our Price:  £174.95
Excl. VAT. (£209.94 Inc. 20% VAT)

Portwest FB31 Structural Fire Firefighter Trousers

The Portwest FB31 Structural Firefighter Trousers feature a moisture barrier layer to allow your body heat to escape, thereby qualifying the garment for a Level 2 firefighting certification under EN 469. The trousers allow for full freedom of movement, while protecting you from extremely high temperatures of both flames and radiant heat.

What Can the Structural Fire Firefighter Trousers Do for Me?

The trousers have numerous helpful features, including the following:

  • Flame Resistant: Nomex outer shell fabric protects against flame injury and burns caused by conductive heat
  • Breathable: Middle shell acts as a moisture barrier, allowing internal moisture and heat to escape and protecting against the convective transfer of heat
  • Heat Resistant: Inner thermal shell and lining offers protection against heat from proximity to skin, pockets of air between all three layers also help to insulate
  • Mobility: Design offers high freedom of movement, with side elastic and bellow front fly
  • Secure: Non-detachable shoulder braces for a secure fit

Who Can Use the Firefighter Trousers?

The trousers have been designed to combat the most severe structural fires. They will protect you from the flames and radiant heat of a structural fire, while ensuring your own body heat can escape. The trousers are ideally paired with the Portwest FB30 Firefighter Jacket.

Which Size Is Right for Me?

To establish the correct size for you please measure the circumference of your waist as illustrated in the diagram. Then, with reference to the table below, select the right option from the drop-down menu at the top of the page.

Waist Measurement

Size Waist Circ. (cm)
Small 76 - 80cm
Medium 81 - 88cm
Large 89 - 96cm
Extra Large 97 - 104cm
XX-Large 105 - 112cm
XXX-Large 113 - 120cm
XXXX-Large 121 - 128cm

What Certifications Have the Structural Fire Trousers Received?

The Portwest trousers have undergone extensive testing, so you can be certain of your safety at work. It has received the following certification:

  • EN 469
    • Level 2

What Do These Certifications Mean?

  • EN 469: This standard specifies requirements for protective clothing to be worn during firefighting operations and associated activities

The Portwest trousers have been awarded the highest level of suitability for firefighting under EN 469. This means the trousers are ideal for tackling the most intense of indoor conflagrations.

Key Features of the FB31 Structural Fire Trousers

  • Anti-wicking strip for moisture management
  • Sew on flame resistant industrial wash tape for increased visibility
  • Low-cut crotch seam, side elastic and bellow front fly for freedom of movement

Washing Instructions for the Portwest Trousers

  • Wash at 60°C or below
  • Do not bleach
  • Tumble dry at medium temperatures
  • Iron at medium temperatures
  • Fasten all closures before washing
  • Machine wash using liquid detergent
  • Hand dry out of direct sunlight
  • Do not iron on reflective tape
  • Tumble drying is necessary to activate the fluorocarbon finish

Technical Details of the Portwest Trousers

  • Moisture Barrier: FR Knitted fabric with PU membrane, 85g
  • Thermal Layer: FR non-woven
  • Inner Thermal Layer: FR Aramid Viscose, 360g


Conformity Statement User Instructions 1
Declaration of Conformity User Instructions

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This item will be dispatched by 1st Class Royal Mail, DPD courier or UPS courier.

The estimated delivery time for this item is usually 1-3 working days when ordered before 14:00, Monday to Friday (excluding Bank Holidays).

Please contact our Customer Care Team on 020 7501 0598 for an up to the minute delivery expectation for this product.

UK Delivery Charges

Certain orders delivered to the UK are subject to a delivery charge; refer to the table below for more information. Please note that all values are listed exclusive of VAT.

Order Value UK Delivery Charge
Up to £39.99 £4.95
£40.00 and over FREE

Coronavirus Update

Please note that, due to the current COVID-19 pandemic, our processing time may increase slightly. We would advise that orders may be set back by as much as five working days, though we are striving to keep our delivery schedule as close to normal as possible.

If you have been waiting over 7 working days for your order and would like an update, please contact our Customer Care team at helpdesk@workwear.co.uk.