Portwest S351 Sealtex AIR Trousers
 Portwest S351 Sealtex AIR TrousersPortwest S351 Sealtex AIR Trousers 

Portwest S351 Sealtex AIR Trousers

  • Waterproof and breathable trousers
  • For men working outdoors in wet conditions
  • Welded seams and fabric finish for waterproofing
  • Adjustable hems and elasticated waist for secure fit
Our Price:  £15.07
Excl. VAT. (£18.08 Inc. 20% VAT)

Portwest S351 Sealtex AIR Trousers

When performing physical work outdoors it's important to remember to wear breathable clothes as well as waterproof ones. The Portwest S351 Sealtex AIR Trousers are totally waterproof but also made from a breathable fabric that will draw moisture away from the body and keep the wearer cool and dry. 

What Can the Portwest Sealtex AIR Trousers Do to Help Me?

The Sealtex AIR Trousers has several helpful features:

  • Waterproof: Waterproof fabric finish and welded seams to prevent water penetration
  • Breathable: Breathable, lightweight fabric draws moisture away from the body, keeping you dry without weighing you down
  • Durable: Durable, stretchy fabric with wipe clean finish
  • Secure: Stud adjustable hems and fully elasticated waistband for a secure and comfortable fit

Who Are the Portwest Trousers For?

The Sealtex Trousers are ideal for men performing physically demanding work outside in wet conditions. The trousers are waterproof, and breathable enough to prevent you from overheating or becoming uncomfortable. 

What Size Is Right for Me?

To find the right size, consult the table below. 

Size Waist Measurement (cm)
Extra Small 68 - 72cm
Small 76 - 80cm
Medium      84 - 88cm
Large 92 - 96cm
Extra Large 100 - 104cm
XX-Large 108 - 112cm
XXX-Large 116 - 120cm

What Is the EN 343 Standard?

The EN 343 Standard outlines the garment's level of protection against wet weather. The garments are rated on their response to precipitation, fog and humidity, and then on their breathability under those conditions. The Trousers have a 3:2 rating, meaning that they have the highest level of rain protection and an intermediate level of breathability. 

Level Water Resistance Breathability
Level 1 Minimum level of rain protection Not classified as breathable under EN 343
Level 2 Intermediate level of rain protection Intermediate level of breathability
Level 3 Highest level of rain protection Highest level of breathability

What Is Sealtex Classic? 

Sealtex is a high technology, PU coated fabric, on a flexible, resistant polyester, which consistently achieves top scores on hydrolysis and hydrostatic testing. These garments are guaranteed to keep the wearer dry in adverse conditions, with welded seams to ensure wind and rain are locked out. The durable, stretchy fabric can be easily wiped clean, allowing all Sealtex garments to look good and last for longer. 

What Is Texpel Splash Water Repellent Finish?

The Trousers feature a Texpel Splash water-repellent finish. This means that water beads away from the fabric surface, all while allowing for maximum breathability. Texpel also repels dirt, prevents stains and enhances the removal of any stains that do occur. 

What Is Portwest's Select Rainwear Range?

The Portwest Rainwear collection allows for optimum outdoor performance. These garments are made from highly waterproof and breathable fabrics, ideal for protecting against harsh weather conditions. If you would like to know more about the brand, try our blog on Portwest.

Is the S351 Right For Me?

The S351 are great waterproof trousers, which can be ideally paired with the Portwest Sealtex AIR Jacket.

How Should I Care for the Trousers?

  • Wash at 30°C or below
  • Drip dry
  • Do not bleach
  • Do not tumble dry
  • Do not dry clean
  • Do not iron

What Are the Key Features of the Portwest Sealtex Trousers?

  • Breathable fabric to draw moisture away from the body keeping the wearer cool, dry and comfortable
  • Durable and stretchy with wipe clean finish
  • Waterproof with welded seams to prevent water penetration
  • Fully elasticated waistband for ultimate wearer comfort
  • Stud adjustable hems for a secure fit
  • Extremely water resistant fabric finish, water beads away from the fabric

What Are the Technical Details of the Waterproof Trousers?

  • Shell Fabric: 100% Polyester, Tricot Knit, PU Coated 180g

Conformity Statement

Declaration of Conformity
Declaration of Conformity

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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