Kask Protone Road Cycling Helmet
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Kask 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 Protone Road Cycling Helmet

The Kask Protone helmet provides the perfect blend of aerodynamic performance, low weight, maximum ventilation and amazingly stylish looks. Kask’s top of the range road helmet developed in partnership with Team Sky has been proven in the toughest pro-cycling races around the world.

Weighing just 230 grams the Protone is not only lightweight but incredibly aerodynamic too. It was developed using extensive wind-tunnel testing beyond typical testing boundaries, with Kask continuing to modify the profile of the helmet until it performed excellently with the head in any position. 



Produced using their innovative ‘In-Moulding’ system the Kask Protone helmet features a fully adjustable floating cradle and internal gel pads which together provide a close, comfortable fit. The Kask’s notable up and down adjustment system means it is one of the most precise fitting helmets out there thanks to its unique double pivot design. With an eco-leather chinstrap which is anallergic & washable helping to avoid skin irritation, a rubberised Micro Dial adjuster on the back of the helmet and a floating cradle with internal gel pads for the Kask Protone features Coolmax inner padding treated with an antibacterial and antimicrobial process to help keep the helmet fresh and odour free. 



  • Lightweight and incredibly aerodynamic
  • ‘In-moulding’ technology for enhanced shock absorption
  • ECO Chinstrap - anallergic & washable
  • ‘Up ‘n’ Down’ adjustment – double pivot cradle
  • Sanitised antibacterial and antimicrobial inner pads
  • Internal shock frame


Sizing and Fit

  • Medium - 52-58cm / 20.5”- 22.8”
  • Large - 59-62 cm / 23.2” - 24.5”



  • Medium - 230 grams
  • Large - 250 grams


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.



Mr WooReally light , nice fit .
BobExcellent helmet: light as a feather, great fit, very comfortable.
Mr crawfordLight, comfortable, looks the business
Mr Cutlerlooks good, fits really well and feels nice and light on my head. great product, and fast delivery from Merlin.
D JellettBeen looking to upgrade my helmet for a while and having had kask already this seemed the obvious way to go. Also tried a met Trenta but in terms of comfort this was way better. Would recommend to anyone.
Mrs MALONEThis is second purchase for me. I like this Kask helmet. My first one was broken because car crashed me. The helmet protected my head. Have to say a high quality one.
Mr LottSuper prompt service and the helmet seems good so far. Nice fit on the large and it doesn't make me feel like a mushroom
Mr BlencoweFantastic, lightweight and very comfortable..
Miss LammymanJust what I was looking for. Super light and has a ponytail hole at the back which I like. The chin strap is a nice touch too
Mr BondGreat fit and super light so you hardly notice you're wearing. would recommend
DARNice fitting helmet, certainly an upgrade on my previous helmet. Expensive but so is your head!!
Mr DIAZServicio de entrega muy rápido. El casco se ajusta a la perfecciòn, sin duda un caso de mucha calidad. Para un contorno de 58 cm compré talla M y me queda perfecta,
Mr NaumiukUpgraded from Kask Mojito after small crash and little hit on the pavement. Proton fits perfectly and feels so much lighter. Good venting and comfort. Recommending this item.
Mr GuohuiLove it. Great fit and the strap is superbly designed. Easy to clean.
JonThis will be my third Kask Protone helmet having had the misfortune to have been involved in 2 high speed crashes where they protected me from a serious head injury or potentially worse. They are not cheap but it’s a small price to pay...
AndrewAs expected. Much more compact than my previous Giro Aiglis. Decided to go with L rather than M (I was in between sizes). This was the right choice. M felt like it sat on top of my head as opposed to over my head.
DavidI’ve tried several helmets over the past few weeks and this is by far the best, and the one I will end up keeping, good adjustability and sits right, although admittedly is is the most expensive
CBNice and light but I couldn’t get a good fit on this unfortunately so I’ve now got a Giro Aether MIPS (from Merlin, it’s brilliant) instead.
Mr francartFantastic helmet so light . I use it to race mainly and unlike other helmets I have there isn’t much sweat on the pads as the helmet is so well ventilated. Quick delivery from merlin as always
Mr IrvineGreat product and fits really well. Good quality with a nice smooth comfortable leather chin strap..
Mr WolfeThis helmet is light, extremely comfortable and cool on hot days. It is very stable on your head. Overall the best helmet I have used
Mr BoothFantastic buy, Very comfortable and love the attention to detail.
Mrs ChalmersExcellent helmet. Very light. The only downside is that there is no adjustment in the v-straps that come down over your ears .
Mr JonesThis is my 4th kask helmet I’ve purchased over the years. Excellent quality and typical fast delivery from Merlin
NickBought as a replacement for an old Giro helmet. I have a Kask MTB helmet that is by far and away the most comfortable I've ever used, so seemed sensible to go for the same brand. Only used a couple of times so far but it's great. The fit is spot on, its light as a feather and even reasonably stylish (for a cycle helmet!).
Mr ShawBeen looking for a suitable lid for a while. Tried a few different ones on but when it came to the Protone, it fitted like a glove straight away so for me comfort won over cost. Saved a few pounds getting it from merlin cycles, win win for me
Mr AndrewsReally please with this purchase. Have used it a couple of times now and it feels very light but secure. In fact it feels as though I'm not wearing it, if that makes sense! Love the security, of it and the brilliant construction. Merlin cycles sold it for a good price too!!
Rei QIUVery good, this is one of the best helmets I owned. Very comfortable.
ClokeReally 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.
Mr PijanowskiThis is one of the best helmets I owned. Very comfortable. My Giro Aeon cracked after crash and replaced with Kask Protone.
WalterThe most comfortable helmet amongst other brands, good looking and easy to fit. A little bit heavier than others, but i still recommend this product.
Mr ReaIt'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.
Chris BrowneLove 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!