Kask Protone Road Cycling Helmet
Kask Protone Road Cycling HelmetKask Protone Road Cycling HelmetKask Protone Road Cycling HelmetKask Protone Road Cycling HelmetKask Protone Road Cycling HelmetKask Protone Road Cycling HelmetKask Protone Road Cycling HelmetKask Protone Road Cycling HelmetKask Protone Road Cycling HelmetKask Protone Road Cycling HelmetKask Protone Road Cycling Helmet
KASK’s most advanced helmet to date, the Protone was developed in collaboration with Team Sky. It has among the fastest heat dissipations and lowest drag co-efficients of any ventilated helmet.
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Aerodynamic performance, low weight, maximum ventilation, amazing looks. The Protone weighs just 230g and uses a 3D Dry padding with a multi-layer open cell construction process to give a more comfortable ride. It has removable and washable inner padding, made from CoolMax® fabrics and its inner padding fabric has been treated using the Sanitized® antimicrobial process. Additionally, its Octo Fit adjustment system guarantees a perfect fit to any kind of head shape. KASK has also continued to use its Multi In-Moulding Technology to create a polycarbonate cover for the top, base ring and the back of the helmet’s shell. This is joined to the inner polystyrene cap via KASK’s In-Moulding Technology to improve the shell’s shock absorption. Its strengthened frame further reduces the risk of a shock breaking the shell.



3D dry

  • The tridimensional 3D DRY padding utilizes a multi-layer open cell construction process: high technology for the best comfort and performance.

Aero Control

  • Incredibly aerodynamic and top performing shell, tested in the wind-tunnel and able to provide a really impressive CX rate. Any position the head will assume the outflow of the air will be perfectly in line with the helmet.


  • Coolmax - Removable and washable inner padding in Coolmax® material

ECO Chinstrap

  • Chin pad with eco-leather chinstrap
  • The anallergic and washable chinstrap is extremely comfortable and helps to avoid irritation of the skin


  • In case of shock it avoids the break of the helmet into pieces

M in moulding

  • The innovative “in moulding” technology, joining the inner polystyrene cap to the outer polycarbonate one, ensures a better shock absorption.


  • The MIT Technology, applied to all KASK cycling helmets, guarantees a higher safety and a complete protection thanks to the polycarbonate layer that covers the shell on the top, on the base ring and on the back.


  • Rubberised Micro Dial adjuster provides improved finger grip
  • Floating cradle contact points combine internal gel pads for optimum comfort. These supports are designed to oscillate freely through 180° allowing a perfect fit on any shaped head
  • The Skeletal Brackets of the cradle have been designed and refined to provide the best fit and support whilst being as light as possible       


  • Inner padding fabric treated with antibacterial and antimicrobial Sanitized® process.


  • M - 52-58 cm – 20-1/2 - 22-7/8 Inches
  • L - 59-62 cm – 23-3/8 - 24-1/2 Inches



  • 230 gr. M Size (CE EN 1078)
  • 250 gr. L Size (CE EN 1078)


CE EN 1078  

These Helmets are certified with a European CE EN1078 standard. This is a European standard and although the helmet is perfectly safe to use, specific countries may have their own certification which is legally required if you intend to wear the helmet recreationally or in a competitive racing environment. If you are unsure, please check your specific country requirements and check with the manufacturer to see if the helmet has received any additional certification.

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Really great product. Have used in 35 degrees on climbs and not too hot. Also sound of air rushing past ears is quieter than other helmets I've used which was a pleasant surprise. Merlin offered a very competitive price with great service again.
This is one of the best helmets I owned. Very comfortable. My Giro Aeon cracked after crash and replaced with Kask Protone.
The most comfortable helmet amongst other brands, good looking and easy to fit. A little bit heavier than others, but i still recommend this product.
It's surprisingly more airy than my Giro Aeon, even stationary. It's different as it sits low around the forehead which probably provides better protection and has a vey low profile (no mushroom head). Though she's not cheap it's still the best helmet I've had.
Love this helmet. Fits great, superb quality and attention to detail in the Design, plus it performs superbly. Airflow through the helmet is good, but still feels aero, with the wind breezing smoothly on windy days. Super quick and efficient delivery from Merlin - nice!