The Portwest DX458 DX4 Winter Trousers are insulated bib trousers for outdoor work in cold, wet weather. A waterproof stretch Oxford shell with taped seams keeps rain out, while Insulatex™ Pro filling holds in warmth.
The bib and braces zip off at the back, so you can wear them as full bib trousers on the coldest days or as standard trousers when you need less coverage. With 16 pockets, including pre-bent knee pad pockets and zipped thigh storage, they suit physical work that involves kneeling and carrying tools.
Key features
- Durable 300D stretch Oxford shell with a water-repellent finish, so water beads off the surface
- Detachable bib and braces with a zip-off back to switch between bib trousers and trousers
- Pre-bent, top-loading knee pad pockets with two height positions to place pads where you kneel
- Multiple zipped side and thigh compartments keep your phone, pens and small tools secure
- Rule pocket, phone pocket and hammer loop keep everyday tools close to hand
- Reflective tape helps you stay visible in low light
- Adjustable hem converts from regular to long leg length
- Crotch gusset, bartacks at all stress points, side elastic waist, zip fly with Portwest branded stud button and easy-grip zip pullers
Materials and performance
Shell: Portwest Extreme Waterproof, 100% polyester 300D stretch Oxford with a stain resistant finish and PU membrane, 200g. Lining: 100% polyester, 52g. Filling: Insulatex™ Pro, 100% polyester, 160g.
Standards and protection
Certified to EN 342 (0.367M². K/W (B), 2, X) for protection against cold and EN 343 Class 3:1 X (WP 20,000mm) for protection against rain. The knee pad pockets meet EN 14404: 2004 + A1: 2010 Type 2 Level 0 when used in combination with S156 knee pads, and the trousers are UKCA marked.
Fit and sizing
Slim fit. See our Portwest Sizing Guide for detailed information.
Using the detachable bib
Keep the bib and braces attached for extra warmth and coverage across the back and chest in freezing conditions. Unzip it at the back to wear the trousers on their own when you are working harder or the weather is milder.
Care
- Machine wash at 40°C
- Do not bleach
- Do not tumble dry
- Drip dry
- Do not iron
- Do not dry clean
Add your logo
If you’d like to add your logo to the Portwest DX458 DX4 Winter Trousers, please contact us.



































