Skip to content
Waterproof Work Trousers: The Complete Buying Guide for UK Tradespeople
- by Mike Johnson
View the full range here → Helly Hansen Workwear Collection
If you work outdoors in the UK, waterproof trousers are not optional kit. The question is not whether you need a pair, but which type - and there is a genuine difference between a £5 pull-on overtrouser and a £180 padded salopette that goes well beyond price.
This guide covers the three types of waterproof lower-body workwear, explains what the EN 343 rating actually tells you, and names specific products from the Active Workwear range at every price point so you can match the spend to the work.
The Three Types, and Which One You Actually Need
Almost every waterproof trouser falls into one of three categories. Getting this decision right matters more than the brand you choose.
Overtrousers are lightweight shells you pull on over your normal work trousers when it starts raining. They pack down small, go on in seconds over boots, and cost very little. They are the right answer for anyone whose exposure to rain is occasional rather than constant - electricians moving between van and property, delivery drivers, warehouse staff with loading bay duties. They are the wrong answer for a full shift of site work, because the fabric is thin and will not survive kneeling on hardcore.
Dedicated waterproof trousers are built as your primary garment for the day. They use heavier outer fabrics, reinforced knee areas, proper pocketing, and a bonded membrane rather than a coating. You wear them instead of your normal work trousers, not over them. This is what you want if outdoor exposure is the job rather than an occasional interruption to it.
Bib and brace waterproofs, also called salopettes, extend the coverage up over your torso. That removes the gap at the waistband where water gets in when you bend or kneel. Groundworkers, drainage crews, and anyone working in standing water or deep mud will feel the difference within a shift. They are bulkier and slower to get on and off, which is the trade-off.
Understanding EN 343
EN 343 is the European standard for protective clothing against rain, and it is expressed as two numbers, such as EN 343 3:2.
The first number is water penetration resistance, rated 1 to 4. Class 1 handles light rain and brief exposure only. Class 2 covers regular outdoor work in typical UK conditions. Class 3 is the practical standard for most site and outdoor trades. Class 4 is for extreme, sustained exposure in unsheltered environments.
The second number is breathability, rated 1 to 3. Class 1 suits low-activity work. Class 2 is adequate for most trades. Class 3 is what you want for physically demanding roles, because non-breathable waterproofs leave you soaked from the inside regardless of how well they block rain.
For most outdoor site workers, EN 343 3:2 is the sensible minimum. If your work is physically hard as well as wet - groundwork, civils, landscaping - look for 3:3.
Be aware that plenty of garments are marketed as waterproof without carrying EN 343 certification at all. If the rating is not stated, treat it as water-resistant rather than waterproof.
Seam Taping: The Detail That Separates Good From Adequate
Waterproof fabric alone does not make a waterproof garment. Every stitch line is a row of holes, and under sustained rain water will find them.
Fully taped seams are sealed across the entire garment. This is the standard you want for sustained heavy rain or exposed work. Critically taped seams cover only the main structural seams, which is fine for moderate conditions but will let water through the secondary seams in a genuine downpour. Welded seams, used on some premium products, replace stitching entirely at the joins and are the most reliable of the three.
Check this before you buy. It is the single most common reason a garment that claims to be waterproof leaks.
Budget Options - Under £20
At this end of the range you are buying an overtrouser for occasional use, and that is a perfectly sensible purchase if that matches your work.
The Beeswift Nylon Lightweight Waterproof Over Trousers (NBDT, £5.07) are about as cheap as certified rainwear gets. Keep a pair in the van for unexpected weather. They will not survive site abuse but they were never meant to.
The Portwest Lightweight Rainproof Over Trousers (S441, £5.90) sit at a similar level and serve the same purpose - a packable layer for changeable days.
The Portwest Sealtex Ocean Waterproof Over Trousers (S251, £12.25) step up in build quality while remaining an overtrouser. A better choice if you are pulling them on more than occasionally.
The Portwest Sealtex Waterproof Over Trousers (S451, from £15.12) and the Portwest Sealtex Air Trousers (S351, £18.55) offer the same Sealtex construction with more attention to comfort. The Air version is the more breathable of the two, which matters if you are moving around in them.
The Beeswift Bdri Waterproof Over Trousers (SBDT, £18.69) carry an EN 343 Class 3 waterproof rating, which is unusually good at this price. If you want certified Class 3 protection without spending much, this is the pick of the budget tier.
Worth noting: the Beeswift Dri Nylon Waterproof Suit (NBDS, £8.99) and the Portwest Budget Nylon PVC Rain Suit (L440, £13.93) are jacket and trouser sets rather than trousers alone. For emergency kit or a spare set for a team, they are hard to argue with on price.
Mid-Range - £25 to £55
This is where dedicated waterproof trousers begin, and where most regular outdoor workers should be looking.
The Portwest PW3 Rain Trouser (T604, £27.65) is a breathable waterproof in a slim-fit cut. The slimmer leg is a genuine advantage if you have found older waterproofs baggy enough to catch on scaffold or plant.
The Regatta Wetherby Padded Insulated Over Trouser (TRA368R, £34.97) adds insulation to the waterproofing. For winter outdoor work where you are stationary or moving slowly - marshalling, plant operation, security - the padding makes a real difference. For physical work you will overheat in it.
The Blaklader 1866 Lightweight Waterproof Rain Trousers (£42.75) include zipped leg openings, which sounds like a small thing until you have tried to get waterproofs on over boots without them. Blaklader build quality at a sensible price, and the lightest genuinely site-capable option in this bracket.
The Snickers 8201 Waterproof Rain Trousers (£55.70) use welded rather than taped seams. That is a step up in reliability over anything cheaper in this list, and the lightweight construction means you will actually keep them on rather than shedding them the moment the rain eases.
Premium and Salopettes - £54 and Above
If you are outdoors in the wet all day, every day, this is where the money is well spent.
For bib and brace, the Portwest Sealtex Waterproof Bib and Brace (S453, £19.25) is the value entry point, and the Beeswift Bdri Breathable Bib and Brace (SBDBB, £29.00) adds EN 343 Class 3 waterproofing and breathability for not much more.
The Blaklader Heavy Duty Hi-Vis Waterproof Bib Overalls (1386, £54.36) combine full waterproofing with hi-vis compliance in a genuinely heavy-duty build. A strong choice for civils and utilities work.
The Portwest PW3 Hi-Vis Winter Waterproof Padded Bib Trousers (PW351, £64.26) and the Portwest PW3 Hi-Vis Rain Bib and Brace (PW356, £61.53) cover the same ground with Portwest's PW3 styling. The PW351 is the insulated version for winter.
At the top end, the Helly Hansen Alna 2.0 Stretch Construction Bib Pants (77520, £125) bring four-way stretch to a waterproof bib, which is unusual and makes a noticeable difference to how the garment moves with you. The Helly Hansen Alna 2.0 Winter Construction Salopette Class 2 (71491, £175) is the fully insulated, Class 2 hi-vis version - the most capable cold-and-wet garment in the range.
The Snickers 6620 AllroundWork Waterproof Padded Trouser Salopette (£183.58) is the most expensive option here and is aimed squarely at people who work outdoors through a full UK winter and want the job to be tolerable.
The Helly Hansen Oxford Bib (77562, £95) sits between these, offering a well-built waterproof bib without the winter insulation.
Hi-Vis and Rail Requirements
If you work on highways, rail, or any site specifying high-visibility clothing, your waterproofs need to meet EN ISO 20471 as well as EN 343. A waterproof that is not hi-vis compliant will not satisfy a site induction, no matter how good it is at keeping rain out.
Several products in the range carry both. The Portwest Hi Viz Waterproof Contrast Bib and Brace Unlined (S488, £24.65) and the Waterproof Hi-Vis Bib and Brace Unlined (S388, £25.76) both meet RIS-3279-TOM for rail work at a reasonable price. The Portwest Rail Hi Vis Class 2 Extreme Waterproof Stretch Bib and Brace (S594, £30.45) adds stretch to the same rail specification.
For flame retardant environments that are also wet, the Portwest Bizflame Rain Unlined Hi-Vis Antistatic FR Bib Trouser (S780, £39.06) covers RIS-3279-TOM alongside FR and antistatic protection.
Always confirm the exact standard your contract requires before buying. EN ISO 20471 Class 2 and RIS-3279-TOM are not the same thing, and sites are strict about it.
Matching the Purchase to Your Trade
Construction and general site work. Dedicated waterproof trousers at EN 343 3:2 or better, with reinforced knees. The Blaklader 1866 or Snickers 8201 cover this well.
Groundwork, drainage, and civils. Bib and brace with full seam taping. The Blaklader 1386 for hi-vis requirements, or the Portwest PW3 range. If the ground is standing water rather than mud, look at chest waders such as the Portwest Safety Chest Waders (FW74, £30.66) or the steel-toe Dunlop Work It Safety Chest Waders (NB2KLCW, £82.00).
Blaklader Heavy Duty Hi-Vis Waterproof Bib Overalls 
Portwest Safety Chest Waders 
Dunlop Work It Safety Chest Waders
Rail and highways. Class 2 hi-vis plus EN 343, and check whether RIS-3279-TOM applies. Portwest S488, S388, or S594.
Electricians and multi-trade. An overtrouser is usually enough. The Portwest S251 or Sealtex Air S351 give you real protection without carrying a heavy garment you rarely wear.
Winter outdoor work. Insulated salopettes. Helly Hansen 71491 or Portwest PW351, with the Regatta Wetherby as a budget insulated alternative.
Landscaping and grounds maintenance. Breathable is more important than you might expect, because the work is physical. Snickers 8201 or the Portwest PW3 T604.
Common Mistakes
Buying water-resistant instead of waterproof. A DWR surface coating handles a shower. It does not handle a shift. Check for a stated EN 343 rating.
Using overtrousers for full-day site work. They are not built for kneeling, scraping, or sustained wear. Using them that way means replacing them repeatedly, which costs more than buying the right thing once.
Ignoring breathability. A completely waterproof, non-breathable trouser will leave you as wet as no trouser at all if you are working hard. Class 2 minimum, Class 3 for physical trades.
Not sizing up for layering. Waterproofs worn over thermals or work trousers in winter need to be a size larger. Buying your normal size means restricted movement and a garment you stop wearing.
Overlooking seam taping. Waterproof fabric with untaped seams is not a waterproof garment.
Looking After Them
Regular care extends the life of waterproof kit considerably, and it is not complicated.
Wash at 30 to 40 degrees using a technical cleaner such as Nikwax Tech Wash. Ordinary detergent leaves residue that blocks the membrane and degrades the water-repellent finish. Never use fabric softener - it destroys the DWR coating and the damage is difficult to reverse.
Heat reactivates DWR. Where the care label allows it, tumble dry on low to medium after washing. If tumble drying is not permitted, a warm iron over a damp cloth achieves something similar.
When washing and heat no longer restore water beading, re-proof with a product such as Nikwax TX.Direct. For garments in heavy use, once or twice a season is about right.
Store waterproofs hanging or loosely folded rather than tightly compressed, which can damage the membrane over time.
Frequently Asked Questions
What does EN 343 3:2 actually mean?
The first number is water penetration resistance from 1 to 4, where 4 is highest. The second is breathability from 1 to 3, where 3 is most breathable. So 3:2 means high water resistance with moderate breathability - a sensible baseline for UK outdoor work.
Are overtrousers the same as waterproof work trousers?
No. Overtrousers are lightweight shells worn over your normal trousers for convenience. Dedicated waterproof trousers replace your work trousers and are built to take site wear. Both are useful, for different situations.
How much should I spend?
If you are outdoors occasionally, £15 to £20 on a decent overtrouser is sensible. If you are outdoors most days, £40 to £60 on dedicated trousers will cost less over time than replacing cheap ones. If you work outdoors through winter, a salopette at £120 to £180 is a genuine investment in being able to do the job.
Do I need hi-vis waterproofs?
Only if your site requires it. If it does, check whether the requirement is EN ISO 20471 Class 2 or the stricter RIS-3279-TOM rail standard, because they are different and sites do check.
Why do my waterproofs feel wet inside?
Usually one of two things. Either the DWR has worn off and the outer fabric is wetting out, which kills breathability - re-proof them. Or the garment is not breathable enough for the work you are doing, in which case you need a higher breathability class.
Where to Start
For most people, the decision comes down to how much of your working week is spent outdoors in the rain. Occasional exposure means an overtrouser and £20 well spent. Regular exposure means dedicated trousers around the £40 to £55 mark. All-day, all-winter outdoor work justifies a proper insulated salopette.
Browse the full range of waterproof work trousers, or see the waterproof bib and brace collection for salopettes and full-coverage options. For hi-vis compliance alongside weather protection, the hi-vis waterproof range covers rail and highways requirements. To complete the outfit, see waterproof work jackets and thermal base layers for winter layering.
Shop Waterproof Trousers Shop Bib & Brace Shop Hi-Vis Waterproofs
- Posted in:
- Bib and Brace
- EN 343
- Groundwork Clothing
- Hi-Vis Waterproofs
- Overtrousers
- Rail Workwear
- Salopettes
- Waterproof Work Trousers
- Waterproof Workwear Guide
- Winter Workwear
