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KASK Protone Helmet

Model Year
Helmet Size
£159.00 £40.00 discount
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  • Free tracked delivery
  • Trustpilot review 9.3 out of 40.536 reviews

Pros & Cons

  • Aerodynamic.
  • Good ventilation for an aerodynamic helmet with 15 ventilation apertures.
  • Leather straps for extra comfort.
  • The design puts it between an all-out aero helmet and a highly ventilated helmet.
Read more on what our customers have to say about this product


Brand KASK
Type of Racing Helmet All-round helmet
Weight 228 grams


The Protone is the ''do it all'' aero helmet by KASK. The Protone offers the optimal combination of aerodynamics and cooling. Thanks to its Octofit adjustment system and divider ear straps you can adjust your Protone easily, quickly, and precisely for a perfect fit. Its eco-leather strap is very comfortable and prevents irritation to the skin. This strap is washable just like the helmet pads. Thanks to these features the Protone is the helmet perfect for both competitive professionals and
stylish touring riders.

Kask didn't just trust on Team Sky's input alone, so they spent a great amount of time on data research, position analysis (how does a rider move on the bike) and thermodynamic studies. For example: what is the best way to put away cycling glasses in the helmet without increasing drag.

Read more

Find out more on our Blog

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Model Year 2017 / 2018 2017 2017 / 2018 2018
Type of Racing Helmet All-round helmet All-round helmet All-round helmet All-round helmet
Helmet Size S / M / L / 50 - 56 cm S / M / L / 51 - 55 cm S / M / L / 51 - 55 cm S / M / L / 50 - 53 cm
Colour Nero / Bianco / Blue Matt / Nero Lime / Nero Matt / Nero Matt-Rosso Matte Black / Matte Silver Bright Red / Matte Black / White / Fluo Yellow / Matte Black / White / Silver / White / Red Matte Black
Head Circumference 59 - 62 / 52 - 58 / 50 - 56 51 - 55 / 56 - 59 / 60 - 63 60 - 63 / 51 - 55 / 56 - 59 50 - 53 / 54 - 58 cm / 59 - 62 cm
Weight 228 grams 215 grams / 234 grams / 264 grams 286 grams 205 grams
£159.00 £119.95 £137.80 £119.95
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Customer photos


9.3 / 10 Average from 128 reviews | Write a review
9.3 / 10

128 reviews


  • Light weight (5)
  • fit (4)
  • Comfortable (3)
  • weight (3)


  • Expensive (2)
  • Stiff chin strap (1)
  • Quite expensive (1)
  • Shows dirt and marks (1)

Most recent reviews

9 / 10

Adrian, 15 November 2018

A First class helmet

Light,aero,cool. What more could you ask for.

8 / 10

Andrew, 16 August 2018


Looks and feels well made. Sure last a long time. Fingers crossed


  • Light
  • Leather chin strap

9 / 10

Yiannis, 14 August 2018

Great ventilation and comfy fit

I had the Rapido helmet before, which I liked a lot. Protone has much better ventilation, and is apparently (didn't measure it) more aero. Fit is better too, with more adjustment and better contact points.


  • fit
  • ventilation

9 / 10

Jimmy, 7 August 2018

Great fitting helmet

The fitting system of the Kask helmets seems to hug the head perfectly without any pressure points and is comfortable all day. Lots of vents to keep you cool and it looks great too ! The only thing I don't like is the fake leather chin strap....something lighter and more supply would be better.


  • comfort
  • lightweight
  • ventilation


  • Stiff chin strap

9 / 10

Noel, 2 August 2018

Great bit of kit...

The Protone is a great bit of essential kit. Have had a few different helmets (Synthe / S Works) and in my opinion this is the best looking and most comfortable to date. Loving the stealth looks and leather chin strap. Adjustable liner works really well and all important sunglasses storage slots don't let you down. Was not thinking about a new helmet but with the TOUR Deals it was too good a deal to be missed!


  • Looks
  • Comfort


  • Expensive

All specifications

Detailed product description


3D Dry
The padding in this helmet uses 3D-Dry technology, which offers optimal comfort and performance.

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.

ECO Chinstrap
An anti-allergenic and washable chin strap with high levels of comfort. Helps prevent skin irritation.

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

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

Octo Fit
The rubber micro dial adjustment system on the helmet can be operated with a single hand. The dial can be turned 180 degrees, allowing you to quickly and easily tune the fit. The Skeletal brackets have been designed to optimally support your head.

The pads have an antibacterial coating designed to prevent any foul smells.