KASK Protone Helmet

KASK Protone Helmet
185 reviews
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  • Free tracked delivery to Portugal
  • Trustpilot review 9.6 out of 75.506 reviews


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Pros & Cons

Pros & Cons

  • Lightweight - you almost don't even notice you're wearing it.
  • Good ventilation for such an aerodynamic helmet with 15 ventilation apertures.
  • Leather straps for extra comfort.
  • The upper part is reinforced with an internal plastic substructure, for better fall protection.
  • Thanks to the Octofit adjustment system and divider earband, this helmet can be adjusted very precisely.
  • Kask does not use MIPS, so that extra bit of security is missing.
  • The leather chinstrap takes some cycling trips to feel comfortable.
Read more on what our customers have to say about this product



Brand KASK
Including Visor No
Ventilation ★★★☆
Road Helmet Type Aero helmet
Weight 228 grams
Extra protection No



The Kask Protone is the ''do it all'' road bike helmet by KASK. It offers the optimal combination of aerodynamics and ventilation. The input of former top team Team Sky (now Team Ineos) and many months of data research have contributed to the development of this race bike helmet.


A lightweight with various vents
With a weight of just 228 grams this helmet is a lightweight, so much so that you barely notice you're wearing it. The various ventilation openings ensure that heat and moisture are quickly dissipated. This results in optimal comfort and improved performances, without compromising on safety.

The internal plastic substructure improves protection against impacts
The upper part of this road bike helmet is reinforced with an internal plastic substructure, so your head is better protected during possible impacts.That bit of extra safety, supplied by for example a MIPS, is lacking in this helmet as Kask does not use the system.

The Octofit adjustment system and the divider ear straps ensure a perfect fit
Thanks to its Octofit adjustment system and divider ear straps you can adjust your Protone easily, quickly, and precisely for a perfect fit that never shifts. A simple turn on the Octofit adjustment system is enough to tighten or loosen the helmet on your head.

The comfortable eco-leather chin strap prevents irritation on the skin
Its eco-leather chin strap is very comfortable and prevents irritation to the skin. This strap is washable just like the helmet pads and therefore easy to keep clean. This also benefits the durability of this road bike helmet, as it will last longer.

In Moulding
This technique connects the inner polystyrene layer to the outer polycarbonate one, together offering more shock absorption.

The MIT technology ensures your head is optimally protected. The polycarbonate layer covers the entire helmet: base, lower ring, and rear.

Aero Control
This helmet is fitted with a wind-tunnel tested aerodynamic shell. Whichever way you’re looking, the air exhaust will always be able to do its work.

This refers to the reflective stickers that make you more visible in the dark.

These features make sure the Protone is the perfect helmet for both professionals and stylish touring riders.

Delivery includes

• KASK Protone helmet
• Cover for storage
• User's Manual
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4.8 / 5
Average from 185 reviews
158 reviews
25 reviews
2 reviews
0 reviews
0 reviews

Photos from customers

Most relevant reviews

5 / 5

Great helmet. Comfortable, fully adjustable and looks the part too

- Darren 27 September 2020

A professional quality helmet that not only does the job, but can be easily adjusted for a perfect fit and is aerodynamic with great ventilation. Good looks are the cherry on the cake, with great colour options. My Black/Red combo complements my bike and kit perfectly. Not cheap, but quality rarely is. Mantel’s discount helped the decision to click the ‘add to basket’ button. No regrets!

Pros & Cons

Comfort and adjustability
Looks and style
Many Colour combinations
Technical features

3 / 5

Light with a good profile but warm and poor pad inserts.

- Andrew 13 August 2020

I bought this as an upgrade to my Specialized Echelon II helmet and unfortunately feel disappointed. On the plus side it is very light, the Medium coming in at the weight advertised. It also has a good profile and looks good on. However, on the negative side I find it much warmer than the Specialized and the venting at the front is nowhere near as good at diverting sweat away from your eyes. In fact, seems to do the opposite. I've also had a problem with the padded inserts where the velcro tape has come away from the helmet when trying to remove the pads which is poor. It is a comfortable helmet when you get the adjustments right but the leather strap is too stiff in my opinion coming from a very flexible fabric strap. Unfortunately I'll probably be looking for a different helmet for warmer weather rides. Shame, as it does look good!

Pros & Cons

Looks good on
Not overly large
Poor adhesive on pads
Stiff strap

5 / 5


- Angela 27 July 2020

Excellent delivery speed, great product

5 / 5

Simply the Best

- Derek 26 July 2020

Third Kask brilliant kit

Pros & Cons

Ease of Adjustable
Light weight
Nice leather stap

4 / 5

Lightweight and cool helmet

- Michael 17 July 2020

The helmet is very lightweight and sits fairly comfortable. However the adjustable unit at the back does not exactly fit my head shape and creates two pinch points, also making it awkward to put on. The Matt black finish is stunning. The v straps at the ears are not adjustable but this does not affect me. The leather chin strap is great but takes time to get used to. I bought this helmet to get a smaller profile as I have a large head, it sits taller on my head and narrower at the sides compared to my cheaper Standard helmet. The air does flow through the vents very well keeping me cool in the warm weather and I would say that this is its best feature. Mantel had the best price on the web for this helmet. Item was carefully packaged and delivered quickly.

Pros & Cons

Chin strap is soft leather
Matt black stunning finish
Modern design and profile
Vents are very effective at cooling
Very lightweight
Adjustable unit at back not good for some people
No mips safety feature
V straps at ears not adjustable

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185 reviews 20 reviews 8 reviews 59 reviews
Including Visor No No No No
Model Year 2017 / 2020 2019 / 2020 / 2021 2021 2019 / 2020 / 2021
Ventilation ★★★☆ ★★★★ ★★★★ ★★★★
Road Helmet Type Aero helmet Aero helmet Aero helmet Aero helmet
Helmet Size (Head circumference in cm) S / M / L / 50 - 56 cm S / M / L / 51 - 55 cm S / M / L / 51 - 55 cm S / M / L / 51 - 55 cm
Colour Bianco / Nero / Nero Matt / Nero Rosso Black / White / Red / Blue / Brown / Orange / Purple / Grey Matte black fade / Matte black red / Matte white silver fade Matte Black Fade / Matte Black/Blue Pearl / Matte Bright Red/Dark Red / Matte Portaro Grey / Matte True Spruce / Matte White/Silver
238,88 172,76 243,97 250,01
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