If you work on the railway, in roadside construction, or in any high-risk outdoor environment, orange hi vis trousers aren't just a uniform choice — they're a legal and safety necessity. This guide covers everything you need to know before you buy, from the standards they must meet to the styles best suited to your job.
Why Orange Hi Vis Trousers? Understanding the Colour Code
Not all hi vis colours are created equal. Yellow hi vis is the default for many industries, but orange hi vis trousers are specifically required in environments where yellow would blend into background signage or machinery — most critically, on and around the UK's rail network.
Network Rail and the rail industry mandate orange high visibility clothing because the colour is distinctly different from the yellow tones of trackside signage. If you're working lineside or anywhere near the operational railway, yellow trousers will not pass inspection — orange is the only acceptable colour.
For road workers, construction crews, and utilities teams, orange is also increasingly preferred where additional contrast and differentiation from other site workers is needed.
The Standards You Need to Know
When shopping for orange hi vis trousers, two certifications matter most:
EN ISO 20471
This is the European and UK standard for high visibility clothing. It covers the minimum retroreflective tape and fluorescent background material required for different classes of visibility:
- Class 1 — Lowest coverage; suitable for low-risk environments
- Class 2 — Mid-level coverage; suitable for roadside and construction work
- Class 3 — Highest coverage; required for the most hazardous conditions (usually achieved by combining a jacket and trousers)
Always check the class of EN ISO 20471 your employer or site safety policy requires before purchasing.
RIS-3279-TOM (Rail Industry Standard)
This is the rail-specific standard that governs high visibility clothing worn on or near the line. If you work in the rail industry, your orange hi vis trousers must carry RIS-3279-TOM certification — EN ISO 20471 alone is not sufficient. Any reputable supplier will clearly state whether a garment meets this standard.
Choosing the Right Style for Your Job
Orange hi vis trousers come in several styles, each designed for different working conditions.
Combat & Cargo Trousers
The most popular choice for general site use. These feature multiple tool and storage pockets, knee pad inserts, and reinforced panels on high-wear areas. If you're moving around a lot and need to carry equipment, combat-style orange hi vis trousers offer the best combination of practicality and safety.
Waterproof Over-Trousers
Designed to be worn over your base layer on wet days. Waterproof hi vis over-trousers are rated to EN 343 for rain resistance and are ideal for outdoor workers who face unpredictable British weather. Look for welded seams and taped seams for maximum weather protection.
Salopettes (Bib & Brace)
Salopettes offer full torso coverage and are favoured in colder months or on particularly dirty worksites. The bib section increases the overall hi vis coverage on the body, helping you achieve Class 3 visibility more easily.
Flame-Retardant (FR) Trousers
For workers in environments with fire or arc flash risk — such as utilities, petrochemicals, or electrical work — FR-rated orange hi vis trousers are essential. These meet additional standards such as EN ISO 11612 or EN 61482 and must not be confused with standard hi vis trousers.
Key Features to Look For
When comparing orange hi vis trousers, look beyond the colour. The best garments for serious site work will include:
- Triple-stitched inseams for durability under heavy use
- Knee pad pockets (top-loading pockets are easier to use)
- Multiple cargo pockets for tools, phones, and equipment
- Adjustable waistband for a secure, comfortable fit
- Reinforced seat and knees in high-abrasion areas
- Reflective tape bands positioned for maximum visibility at night and in low light
Getting the Right Fit on Orange Trousers
Hi vis trousers should be snug enough not to catch on equipment or machinery, but with enough freedom of movement for crouching, climbing, and kneeling. Many brands offer regular and tall leg lengths. If you're between sizes on the waist, size up — especially in stiffer fabrics like polycotton.
For rail garments in particular, a good fit is a safety issue: loose clothing that can snag or restrict movement is a hazard in itself.
Shop Orange Hi Vis Trousers at Safety Workwear
At Safety Workwear, we stock a carefully selected range of orange hi vis trousers to suit every trade and industry. Whether you need rail-compliant RIS-3279-TOM certified trousers, waterproof over-trousers for wet site conditions, or heavy-duty combat trousers for construction work, you'll find the right garment at the right price.
Browse our full range of orange hi vis trousers and get equipped with PPE you can trust.
Frequently Asked Questions
Stay safe, stay seen. Shop the full range of high visibility workwear at safety-workwear.co.uk.