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Endura Pro SL helmet



Lightweight helmet that is super-comfortable but has restricted airflow, a possible compromise for increased safety

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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For its Pro SL helmet, Endura has incorporated Koroyd technology for its crash protection benefits and while it does make for a very light helmet, airflow is compromised. Comfort and fit are very good, though, and the price isn't excessive against the competition.

  • Pros: Barely feels like you are wearing a helmet because of the weight, comfortable fit
  • Cons: Straw-like structure reduces airflow

I spent many years commuting without a helmet purely because I didn't like the way they felt on my head, the weight, the shape whatever I was much happier wearing a cap. The Pro SL is so light and comfortable that would never have been an issue, though; it really doesn't feel like you've got a lid on.

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Because of the Koroyd technology (more of that in a bit), the Endura only requires a very slim EPS shell for its construction to meet the current safety standards. To keep the Koroyd structure away from your head, the Pro SL uses much thicker pads than you'd normally see inside a helmet, but because of how soft they are you never feel even the slightest bit of pressure around your head.


This thin construction also keeps the weight down: this M/L (55-59cm) size weighs just 238g, but it feels even lighter than that.

Adjustment is controlled by the usual thumbwheel at the rear tensioning the cradle that covers about two-thirds of the rear of the helmet.


We've seen a few other helmets using Koroyd, such as the Smith Network and the Overtake, and judging by the claims, it's a very clever system.


It uses a network of co-polymer extruded tubes thermally welded together to create a honeycomb-like structure for strength. Should you crash, Koroyd says, 'The cores crush homogenously which decelerates the energy from the impact reducing final trauma levels.'

The only downside to it is airflow. The Endura has some pretty large vents, with the main 10 full of the tubes. With an open vent, the air flows through pretty much regardless of the angle of the helmet, but with the Koroyd if the helmet isn't on the right plane then things become very warm.


If you are a 'saddle-up, slammed-stem' kind of rider you'll be fine as the tipped angle of your neck ensures the tubes are lying flat, but as soon as you start climbing or taking things easy the air tends to be deflected over the top and things can get a little warm.

I wouldn't say that the Endura is hotter than most of the aero helmets that I've worn, though, and with the small number of vents on offer it probably gives a very similar performance benefit.

> Buyer's Guide: 17 of the best high-performance helmets

Money-wise, at £150 the Endura isn't massively expensive against the opposition. I like the neat details such as the open vents to poke your sunglasses through when you aren't wearing them.

It shapes up well against the HJC Ibex with a similar weight, which costs £179.99.

It's just a smidge more expensive than the Smith Network I mentioned earlier, at £136, but it's lighter.

Overall, it's a decent helmet, and while it's not the most airy it is certainly light. If you value the safety elements of the tubes over breathability then the Endura is probably hard to beat.


Lightweight helmet that is super-comfortable but has restricted airflow, a possible compromise for increased safety test report

Make and model: Endura Pro SL helmet

Size tested: M/L

Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

From Endura:


The Pro SL helmet builds on the success of our award-winning, flagship MT500, bringing the enhanced protection of a full Koroyd core to the road rider. Low weight, exceptional ventilation, a host of novel features and stunning looks come together in this premium road helmet.


Integrated into the core design of the Pro SL Cycle Helmet, Koroyd's engineered tubes absorb energy in a more linear fashion than traditional mountain bike helmets. In the event of impact, the Koroyd tubes crush homogenously, absorbing g-force created by the rider's momentum and lowering the chance of injury.


The Pro SL meets the Koroyd Safety Initiative which sets voluntary lower limits to outperform standard helmet safety requirements. The KSI limits for maximum deceleration and HIC significantly reduce the correlated risk of severe head injuries in real life accidents. Looking at peak g values the KSI limit of 183g reduces the risk of fatal skull fracture to less than 5% from a suprsingly high 40% at the levels required to meet CE certification.


The Koroyd core also allows a more open structure to promote airflow, while the tubes of Koroyd structure within the vents maintain a linear flow of air to maximise breathability, cooling and comfort.


If you're unfortunate enough to be involved in an accident that causes damage to your Endura helmet, our Helmet Crash Replacement Scheme will reduce the cost of replacing your helmet with the same model or nearest model.

Tell us some more about the technical aspects of the product?

From Endura:

Super lightweight design (M/L 238g)

Integrated Koroyd® core for improved impact absorption without weight penalty

Large vents with angled Koroyd® tubes for increased airflow

Meets the Koroyd Safety Initiative (KSI), significantly reducing risk of skull fracture beyond required standards

Front eyewear dock

One-hand micro-adjustment fit system

Antibacterial fast wicking spacer fabric padding

Covered by Endura's Crash Replacement Policy and Endura Product Guarantee

Certified to CE Standard EN1078 + A1 02/2013

90 Day Satisfaction Guarantee

Rate the product for quality of construction:
Rate the product for performance:
Rate the product for durability:
Rate the product for weight (if applicable)
Rate the product for comfort (if applicable)
Rate the product for value:

Tell us how the product performed overall when used for its designed purpose

As a high performance helmet it does a good job.

Tell us what you particularly liked about the product

So light and comfortable.

Tell us what you particularly disliked about the product

Warm when the tubes aren't at the right angle.

How does the price compare to that of similar products in the market, including ones recently tested on

For other Koroyd-equipped helmets like the Smith Network and Overtake mentioned in the review, the price is pretty similar.

Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

The biggest issue with the Endura is how the tubes need to be aligned with the incoming airflow for decent cooling, but on the flipside if you are the type of rider the helmet is aimed at you'll probably be in that position most of the time. It's light, it's comfortable and the price isn't extreme for a helmet of this level.

Overall rating: 8/10

About the tester

Age: 40  Height: 180cm  Weight: 76kg

I usually ride: This month's test bike  My best bike is: B'Twin Ultra CF draped in the latest bling test components

I've been riding for: Over 20 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed

As part of the tech team here at F-At Digital, senior product reviewer Stu spends the majority of his time writing in-depth reviews for, and ebiketips using the knowledge gained from testing over 1,500 pieces of kit (plus 100's of bikes) since starting out as a freelancer back in 2009. After first throwing his leg over a race bike back in 2000, Stu's ridden more than 170,000 miles on road, time-trial, track, and gravel bikes, and while he's put his racing days behind him, he still likes to smash the pedals rather than take things easy. With a background in design and engineering, he has an obsession with how things are developed and manufactured, has a borderline fetish for handbuilt metal frames and finds a rim braked road bike very aesthetically pleasing!

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