Portwest S771 Bizflame Rain Waterproof Fire Trousers

  • Flame resistant, anti-static work trousers
  • Ideal for outdoor industrial settings
  • Highest rating for breathability and waterproofing under EN 343
  • Zipped ankles for ease in fitting over work boots
Our Price:  £48.28
Excl. VAT. (£57.94 Inc. 20% VAT)

Portwest S771 Bizflame Rain Waterproof Fire Trousers

The Portwest S771 Bizflame Rain Waterproof Fire Trousers are excellent for facing potentially hazardous tasks in poor weather conditions. They have achieved the highest possible rating for breathability and waterproofing under EN 343, and make an excellent pairing with the Portwest S770 Jacket.

What Can the Bizflame Rain Waterproof Fire Trousers Do for Me?

The trousers have several useful features, including the following:

  • Waterproof: Waterproof fabric with taped seams to prevent water penetration
  • Breathable: Highest rating for breathability under EN 343, fabric draws moisture away from the body keeping the wearer cool and dry
  • Multi-Hazard: Resistant to brief contact with small igniting flames and light chemical sprays, inherent anti-static properties
  • Functional: Reflective tape for increased visibility, zipped ankles for ease in fitting over work boots
  • Comfortable: Fully elasticated waistband for wearer comfort, adjustable straps with durable buckle closure for secure fit

Who Can Use the Waterproof Fire Trousers?

The trousers are ideal for multi-hazard outdoor environments, where inclement weather conditions are as much of a concern as flame and chemical hazards. The trousers are easy to slip in and out of, thanks to the zipped ankles, and are comfortable enough for all-day wear. Some of the professions and settings for which the trousers are suitable follow here:

  • Electrical workers
  • Industrial plant workers
  • Warehouse workers
  • Fabrication
  • Factory work

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 Bizflame Rain Trousers Received?

The Portwest trousers have undergone extensive testing, so you can be certain of your safety at work. Certifications include:

  • EN 343
    • Class 3:3
  • EN ISO 14116:
    • Index 3
  • EN 13034:
    • Type 6
  • EN 1149:
    • 5: Protects against electrostatic discharge in case of an explosion

What Do These Certifications Mean?

  • EN 1149: This standard demonstrates whether a garment protects against electrostatic discharge in environments such as petrochemical refineries where there is a risk of explosion
  • EN 13034: This standard refers to a garment's ability to protect against spatters from dangerous liquid chemicals
  • EN ISO 14116: This standard specifies whether a garment will protect the wearer from occasional and brief contact with small igniting flames
  • EN 343: This standard outlines the garment's level of protection against wet weather, the first class number referring to water resistance, the second referring to breathability

The trousers have achieved the highest possible rating for breathability and waterproofing under EN 343. The trousers will shield the wearer from brief contact with small igniting flames and dangerous liquid chemicals, as well as electrostatic discharge in the case of an explosion.

Is Further Information Available on These Certifications?

If you would like to find out more about the standards mentioned here please read one of our blogs on the subject. Please see the links below:

Key Features of the Waterproof Fire Trousers

  • Flame resistant waterproof fabric prevents water penetration
  • Breathable fabric draws moisture away from the body and keeps the wearer dry
  • Taped seams to provide additional protection
  • Flame resistant reflective tape for increased visibility
  • Fully elasticated waistband for ultimate wearer comfort
  • Adjustable straps with durable buckle closure
  • Zipped ankles for ease in fitting over work boots
  • Back waist buggy for additional protection
  • OEKO-Tex certified as free from harmful chemicals

Washing Instructions for the Portwest Trousers

  • Wash at 40°C or below
  • Do not bleach
  • Do not tumble dry
  • Do not iron
  • Do not dry clean
  • Use non-biological powder
  • Do not use softener

Technical Details of the Portwest Trousers

  • Shell Fabric: 98% Polyester, 2% Anti-static Carbon Fibre, Breathable, PU Coated 250g
  • Lining Fabric: 100% Cotton Flame Resistant Lining 170g


Conformity Statement User Instructions 1 User Instructions 2 User Instructions 3
Declaration of Conformity User Instructions User Instructions 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.