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KASK Protone Helmet

Model Year
Helmet Size
£139.00 £60.00 discount
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  • Free tracked delivery
  • Trustpilot review 9.3 out of 44.224 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 2019
Type of Racing Helmet All-round helmet All-round helmet All-round helmet All-round helmet / Aero helmet
Helmet Size 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 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 Blue / White / Black
Head Circumference 59 - 62 / 52 - 58 / 50 - 56 51 - 55 / 56 - 59 / 60 - 63 60 - 63 / 51 - 55 / 56 - 59 51 cm / 52 cm / 53 cm / 54 cm / 55 cm / 56 cm / 57 cm / 58 cm / 59 cm / 60 cm / 61 cm / 62 cm
Weight 228 grams 215 grams / 234 grams / 264 grams 286 grams 219 grams
£139.00 £119.95 £128.40 £178.40
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Customer photos


9.3 / 10 Average from 140 reviews | Write a review
9.3 / 10

140 reviews


  • Light weight (7)
  • fit (5)
  • looks (4)
  • Aero (4)


  • Expensive (2)
  • Pricier than alternatives but get what you pay for (1)
  • Fragile (1)
  • not cheap (1)

Most recent reviews

10 / 10

Andrew, 26 March 2019

Italian style

Kask Protone is the best road helmet you can buy. Great price from Mantel.

9 / 10

Anthony, 13 March 2019

Great fit and look

The Protone is a nice looking, lightweight helmet. I’m a 59cm head size and I ordered the medium initially and although it just about fit it was a little snug on the forehead. No room to wear a cap underneath. Returned for a large and the fit is perfect. The large obviously looks bigger than the medium but not a huge mushroom. Looks pro in white with white Jawbreakers. Great helmet. Best price online from Mantel.


  • Design, looks, lightweight, adjustment

9 / 10

Sam, 5 March 2019

Excellent quality, super lightweight

About as good an all round helmet as you can buy. Well built, very lightweight, aero, looks great, available in various colours. Mantel were the cheapest online by far at the time, would highly recommend.


  • Looks
  • Aero
  • Lightweight
  • Choice of colours
  • Build quality


  • Pricier than alternatives but get what you pay for

10 / 10

Andrew, 1 March 2019

Great helmet.

Great helmet. Fits well and looks the business


  • Fit
  • Looks

8 / 10

Evangelos, 12 February 2019

Light and very nice looking helmet!

The only issue is that is very fragile. I was holding it and it hit the fence while I was walking and it got a dent. You have to look after it a lot.!


  • Light
  • Nice looking
  • Breathable


  • Fragile

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.