The Portwest BX321 Ultimate Modular 3-in-1 Trousers are built for active work where your needs change through the day. The modular design converts them from standard work trousers to work shorts, or to hi-vis work trousers when the hi-vis panels are on show.
Storage is a major strength, with 15 pockets in total. Large built-in side pockets take bigger tools and spray cans, and also hold the folded-up legs when you wear them as shorts. Four-way stretch fabric moves with you as you kneel, climb and bend.
Key features
- 3-in-1 modular design converts to work shorts or hi-vis work trousers, so one garment covers several jobs
- Reversible garment for multi-use wear
- 4-way stretch fabric gives ease of movement when kneeling, bending and climbing
- Large built-in side pockets hold bigger tools and spray cans, or store the folded-up legs in shorts mode
- Pockets with magnetic flaps close easily and keep contents covered
- Front-of-leg cargo pocket is easy to reach while you work
- Mesh mobile phone pocket keeps your phone close to hand
- Built-in waistband with adjustable waist lets you set the fit around your middle
Materials and performance
Shell: Titanmill Ultra Stretch, 92% Polyamide, 8% Elastane, 230g. Contrast: CorePro, 87% Polyamide, 13% Elastane.
Standards and protection
Certified to EN ISO 20471 Class 1, compliant only when the hi-vis panels are visible, and to EN 14404: 2004 + A1: 2010 Type 2 Level 0 when used in combination with the specified Portwest knee pads. The trousers are also UKCA marked.
Fit and sizing
Slim fit. See our Portwest Sizing Guide for detailed information.
Clip-on pocket system
Three compatible Portwest pockets clip on and off the trousers at the front or the back. You can add storage where you need it for the task, then remove it when you want a cleaner profile. The side entry knee pad pockets accept knee pad inserts for kneeling work.
Care
- Machine wash at 30°C on a gentle cycle
- Do not bleach
- Do not tumble dry
- Drip dry in the shade
- Do not iron
- Do not dry clean
Add your logo
If you’d like to add your logo to the Portwest BX321 Ultimate Modular 3-in-1 Trousers, please contact us.




























