The Complete phs Guide to Boilersuits and Coveralls

The right boilersuit can make a real difference to safety and comfort, and even to day-to-day performance. Whether your team works outdoors in poor weather, on high-risk sites, or in environments where visibility is crucial, choosing the right coverall helps protect workers and supports your compliance. 

There are many different types of boilersuit, designed for different needs and uses. Some roles call for a hi-vis boilersuit, while others need a flame retardant boilersuit. Seasonal conditions matter too, as some teams will benefit from insulated protection in winter while others need lightweight coveralls that are easier to wear in warmer months. 

In this guide, we'll look at the main types of boilersuits and coveralls, when to use them, and how to choose the right option for your workforce. 

Boilersuit vs overalls: what’s the difference?   

A boilersuit or coverall is usually a one-piece garment that covers the arms, legs and torso. Overalls, on the other hand, often refer to bib-and-brace garments worn with a separate top underneath. 

In practice, they provide quite different purposes. A one-piece boilersuit can offer more complete coverage and reduce exposed gaps, which can be helpful in dirty, wet or high-risk environments. Overalls may give the wearer more flexibility and can be a good option in warmer conditions or for completing lower-risk tasks. Generally speaking, coveralls are often the better choice when full protection is needed, while overalls can suit jobs where layering and flexibility are more important. 

The main types of boilersuit and when to use them    

There's no single best boilersuit for every role. The right choice depends on the hazards involved, the weather, the season and the working environment. 

Hi-vis boilersuits 

A hi-vis boilersuit is designed for jobs where workers need to be seen clearly in low light, poor weather, or busy operational environments. These garments are commonly used in construction, rail, roadside work, logistics yards and depots. 

For many businesses, visibility requirements will influence the colour choice too. A yellow boilersuit is a common option where strong daytime visibility is needed, while orange is also widely used in some rail and infrastructure settings.  

Flame retardant boilersuits   

A flame retardant boilersuit is designed for environments where workers may be exposed to sparks, heat, or short-contact flame risks. This can include welding, fabrication, metalwork and other hot work. 

Standard workwear is not suitable for these conditions. In these settings, it's important to use properly specified garments that are built for the risk involved. A flame retardant boilersuit, for instance, helps reduce risk while supporting safer working practices and better compliance.  

For more specific advice on PPE regarding work around flames, have a look at out blog post on protective gear for welding and other short contact work with flames. 

Waterproof boilersuits  

A waterproof boilersuit is ideal for outdoor teams working in rain, wind and wet conditions. This type of coverall is especially useful in utilities, construction, transport and yard-based roles where workers are exposed to the elements for long periods. 

The key benefit here is of course that it keeps you dry, but a waterproof boilersuit can also have a knock-on effect of helping workers stay comfortable and focused, which matters when conditions are more difficult but productivity still needs to be maintained. 

Lightweight coveralls for warmer conditions 

In warmer months, or in fast-paced indoor roles, lightweight coveralls can be the better option where you still need to protect the skin. A heavy garment may offer a thicker layer of separation, but it can also create discomfort if workers overheat during the day. 

Lightweight boilersuits are often better suited to summer roles and active jobs where it's important for workers to have full mobility. If protection isn't a concern, this is where you might also consider overalls, or dungarees, instead of full coveralls. 

Insulated boilersuits for colder weather    

When teams are working outside in winter or in cold industrial settings, insulated boilersuits can make more sense. These garments help workers stay warm during early starts or night shifts, or long periods in exposed conditions. 

Comfort shouldn't be treated as a minor issue. If workers are too cold, concentration and efficiency can take a hit as a result, so the right coverall will be the one that supports both wellbeing and performance. When workers are likely to be cold, insulated coveralls should be considered. 

Yellow boilersuits and red boilersuits: does colour matter?     

The main difference between the colours of boilesuit it typically that a yellow boilersuit is often chosen for higher visibility purposes, whereas a red boilersuit may simply be used for role identification or brand consistency in certain workplaces.  

There's no universal language that defines what a yellow boilersuit means compared to a red boilersuit. It generally comes down to design choices and the preference of the buyer. 

Which industries use which coveralls?  

Different industries need different types of protection, meaning different tpes of boilersuit will suit their style of work better: 

How to choose the right boilersuit for your team  

The best starting point is always the actual job. Ask: 

• What hazards are present? 
• Is the work indoors or outdoors?  
• Does the task involve flame, poor visibility or wet weather? 
• Will workers be more comfortable in lightweight or insulated coveralls? 
• Does the garment need to support a managed laundering and repair process? 

Choosing the wrong garment is an important part of PPC compliance, and it can also affect comfort and protection. That's why you need to be sure that your chosen boilersuit type fits the reality of the work. 

Why garment management matters   

While it begins with choosing the right workwear, you then also needs to make sure you're looking after it properly to ensure its longevity. 

Laundering, repairs and replacement can help towards this, and are services we provide at phs Besafe, because we regonise the importance of making your workwear last a long time. If garments are damaged, heavily worn or not maintained properly, they may not perform as well as they should. 

Find the right boilersuit for the job    

Whatever the setting, the goal is always that of finding workwear that provides better comfort, and supports safer working. 

If you're reviewing protective clothing for your workforce, we at phs BeSafe can help you choose the right garments for the job and support you with a workwear solution that fits your operational needs. If you're not quite sure where to start, get in touch with our helpful team today.