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Bontrager Jet WaveCel Children’s Bike Helmet



Well made, cool looks and approved safety data, but it's pretty heavy for a kid's lid
Proven technology which gives additional protection for young heads
Bright colour aids visibility
Not that breathable
A big chunk of cash for a kid's helmet

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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Bontrager's Jet WaveCel Children's Bike Helmet comes with Bonty's collapsible structure fitted, which is designed to absorb the force of an impact. It's well proven, which gives plenty of peace of mind, but it does add weight, reduces airflow and whacks the price up.

Bontrager describes WaveCel as a collapsible cellular structure which is designed to be more effective than traditional foam helmets in protecting your head from injury. It's a crumple zone, basically, which absorbs the force of an impact before it reaches your head.

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Virginia Tech, one of the world's most trusted independent impact testers, has given it the thumbs up, and the Jet is ASTM certified rather than just EN-1078, the European standard. The ATSM standard uses a headform with a smaller mass in its impact testing, giving results that are more relevant to the size of a child's head.

WaveCel is quite a bulky product, though, which adds a fair amount of depth to the Jet's overall size. With that comes weight: the Jet tips the scales at 487g, which is heavy for a little neck.

2020 Bontrager Jet WaveCel Children's Bike Helmet - top.jpg

A very similar helmet design from Met that my daughter normally wears is over 100g lighter without the WaveCel.

The other issue is that the Jet doesn't have a huge number of ventilation holes, so it isn't massively breathable, exacerbated by the fact that the WaveCel affects airflow. All these types tend to, though – it was something I found noticeable on the Koroyd-equipped Endura Pro SL. That said, Simon was quite pleased with the ventilation on the Bontrager Starvos WaveCel helmet.

2020 Bontrager Jet WaveCel Children's Bike Helmet - side.jpg

The Jet is a very well made helmet, and it's adjustable too.

The base of the EPS (expanded polystyrene) inner layer is covered in a soft-touch material which takes away any sharp edges and also protects the helmet from being damaged. The ABS polymer outer is tough, too, and will stand up to plenty of knocks and scuffs.

The added bonus of this bright green finish is a little extra visibility if your child is riding on the road. You also get a pack of stickers in the box to personalise the Jet.

A small cradle inside adjusts from 48 to 52cm diameter on this child's version, or 50-55cm on the Youth model also available. It's tweaked easily by way of the rear thumbwheel, and the back can be adjusted for height as well, which also gives clearance for a ponytail.

2020 Bontrager Jet WaveCel Children's Bike Helmet - inside.jpg

Rather than using a traditional clip for the Jet, which can often lead to pinched skin, the Jet uses a magnetic Fidlock buckle which is easy to connect and separate but remains very secure when in use.

2020 Bontrager Jet WaveCel Children's Bike Helmet - clip.jpg

At £69.99, it's a bit pricey, especially when the child is continuously growing. The Met helmet I mentioned earlier, the Yoyo, has a list price of just £30. Admittedly it doesn't come with the size adjustment, using just pads instead of any dials, and the Jet is arguably safer too.

Decathlon's B'Twin 520 Teen Cycling helmet is similar in shape, and costs just £14.99.

>’s guide to the best kids’ mountain bike helmets

Okay, you can't put a price on your child's safety and protection, so if you want what is probably one of the safest helmets out there then the price tag isn't going to be an issue. For me personally, my six-year-old found it really heavy to wear compared to her EN-1078 certified Met, which meant the Jet was rarely the helmet she went for without being prompted.


Well made, cool looks and approved safety data, but it's pretty heavy for a kid's lid test report

Make and model: Bontrager Jet WaveCel Children's Bike Helmet

Size tested: 48-52

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?

Bontrager says, "Safety has never looked so cool. Jet is a kids' bike helmet with skater-inspired style, proven WaveCel protection and a parent-approved price.

'WaveCel is a collapsible cellular structure that lines the inside of the helmet. This Bontrager-exclusive technology disrupts the safety standards that the industry has accepted for over 30 years."

It is well made and the safety claims have been backed up by independent tests, but it is quite heavy.

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

Bontrager lists:

WaveCel advanced helmet technology

Meets ASTM standards, whose tests use a smaller mass headform more realistic to younger riders

Fidlock magnetic buckle fastens easily for a quick, secure, kid-friendly fit

Comes with a free sticker kit

Dialled fit system provides a secure and comfortable fit

Soft and thick helmet pads are removable for easy cleaning

The Crash Replacement Guarantee provides a free helmet replacement if involved in a crash within the first year of ownership

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:

I do appreciate that you are paying for the added benefits of the WaveCel design, but it is a big chunk of cash for a kid's helmet.

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

It has very good safety credentials.

Tell us what you particularly liked about the product

The stickers add a bit of fun.

Tell us what you particularly disliked about the product

Heavy and not very breathable.

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

It's pricier than many children's helmet on the market, like the two I mention in the review, but it's not that badly priced when you compare it to the adult WaveCel helmet options.

Did you enjoy using the product? Yes and no; Isla liked the way it looked but found it heavy and quite warm.

Would you consider buying the product? No

Would you recommend the product to a friend? Yes, if safey was paramount.

Use this box to explain your overall score

Focusing on safety, this is probably one of the best helmets a parent can choose for their child. It does come at a a cost, though, both financially and in weight.

Overall rating: 7/10

About the tester

Age: 41  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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