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Built for speed. And comfort.

An aerodynamic road helmet, designed for all-day wear, that doesn’t have any ventilation doesn’t seem like much of an all-day option to us. Sure, cooking your brains for an hour or so in a 40k TT, or a middle-distance triathlon seems acceptable, but when your races stretch out to multiple hours, you’d give just about anything to feel the slightest gust of wind in your hair. But, the drag reduction (read: free speed) that you get from an aero helmet almost outweighs the suffering. Until now.

Giro’s new Synthe was designed to take what was great about its Air Attack and make it a more comfortable option for long, hot races. The quite-well-ventilated Synthe produces a single drag value from any one of 72 different wind angles, meaning that whether you’re facing a headwind, crosswind, or anything in between, your helmet won’t make any extra drag (think about what classic, long-tailed aero helmets do in crosswinds), thanks to the use of Aero Mesh Panels, which mimic a flat surface while still allowing heat to escape.

  • Roc Loc Air retention adjustment
  • Ventilation channels to provide cooling to the whole head
  • Optics perch
  • CPSC certified
  • Reviews
  • Q & A

Nice Helmet!

  • Familiarity: I've put it through the wringer

This helmet is nice. I t is light weight and best of all it's easy to hold sunglasses. on both the front and back with no issues. There is plenty of venting to keep things cool.

Saved me from serious injury

    This helmet did its job as expected and couldn’t be happier. In less than a week after receiving my helmet I was involved in a crash when the rider in front of me turned left then my front wheel clipped them. Lost my balance and crashed at 20+ mph. I barely felt the impact when my head hit the asphalt as I rolled to distribute the impact of the crash. Helmet is totaled with 4 cracks, something I can easily replace after escaping serious injury.

    Saved me from serious injury

    Good helmet, cheap retention system

    • Familiarity: I've put it through the wringer

    Comfortable, good looking helmet however the Roc Loc Air retention system has failed in less than one year and doesn't seem to be replaceable. Maybe it was not intended for everyday use.

    Cooler heads prevail

    • Fit: True to size

    I tried this on and the fit is a bit more round than other helmets I own. I really liked the how low it sits on my head and has a low profile. A lot of vents are great for cooling your head so you can go faster! It is not the lightest helmet I have tried, but it is not bad and probably protect your head a little better. Great helmet, highly recommend.

    Good looking, size runs small

    • Fit: Runs small

    Hi. Very unfortunate I couldn't use this helmet. The size indicated doesn't really match, so I would suggest to get a larger one if you are quite close to the limit size. I am 54 cms head and according to this, it goes up to 55 cms, but definitely it doesn't it. Other than that, it looks quite light and great design, but simply couldn't use it.

    The Perfect Fit

    • Familiarity: I've used it several times
    • Fit: True to size

    Out of the box, this is the best fitting helmet I’ve ever owned. MIPS certainly is part of that, but even the chin strap has been improved. The strategic placement of the sunglasses holes works well and keeps the glasses from falling off the helmet.

    Speed Demon

    • Familiarity: I've used it several times

    There are two important things to consider when buying a helmet: does this helmet look good and will this helmet make me faster. The answer to both of those questions is YES. The first day I wore this helmet I noticed a number of other cyclists staring at me. One person even stared so long they crashed into an open manhole. It was amazing. The second day I wore this helmet I got QOM on Strava for the Little Cottonwood segment. Don’t try to fact check that; I rode it so fast Strava took it down because they didn’t believe it was a real time. I would say this helmet made me 45% faster on ascents and 55% faster on descents. So if you want to look good, and you also want to smoke your competition, I suggest you buy the Synthe. You won’t be sorry.

    Great!

      I literally have had 7 of these, theres no other helmet I'd rather have. They fit great, ventilate well, and are reasonably aerodynamic. This is a member of the holy trinity of "Cool Road Helmets for Cool, Stylish Folks" (which also includes the POC Octal and Kask Protone). Buy this if you want to look cool and be cool.

      Aero, light, ventilated

      • Familiarity: I've used it once or twice and have initial impressions
      • Fit: True to size

      This helmets checks all the boxes for me. I wanted something aerodynamic but something that can be used from May-September. This was it. Not quite as light as the featherlight Aeon but only by 20 grams so still very light and to top it off the Roc-Loc air system allows for better air transfer through the helmet.

      Best I've worn.

      • Familiarity: I've used it several times
      • Fit: True to size

      First time I have spent this kind of money on a helmet. I have no regrets! I know it's a cliché, but you forget it's there while you're riding. The aero features are noticeable, if you are not accustomed to having an aero helmet. The ventilation is great on my bald noggin.

      So light!

      • Familiarity: I've used it once or twice and have initial impressions
      • Fit: Runs small

      This helmet is extremely light and fits small heads well! I have a very small head and the small fit me perfectly without too much adjustment. The white and silver looked great and matches with everything. If you are looking for a sleek, light and fast helmet this is probably the helmet for you! If you need help finding the perfect helmet shoot me an email at rpankratz@backcountry.com or give me a call on my direct line 801.204.4577!

      Reiley is a legit reviewer, Synthe gets awesome reviews in many good sites. I had a light crash in a non MIPS helmet last year on on a grass CX course. Recently I crashed on a gravel road with a lower coast Giro MIPS helmet. Speaking form real experience, MIPS works and I hear the Synthe is great. I'm getting a Synthe next..

      Aero is the new light weight

      • Familiarity: I've used it several times
      • Fit: True to size

      The Synthe is a pretty cool helmet. As far as helmet options go, it usually seems that for more aerodynamics, both weight and ventilation have to take a back seat. I feel like the Synthe really splits the difference nicely. The helmet has a slightly rounder fit to it, so if you prefer more oval shaped helmets, the fit may not be perfect, but this will fit most people superbly. I absolutely love the sunglass slots too. A very nice touch.

      Forget it's there

      • Familiarity: I've used it several times
      • Fit: True to size

      I tried a few other brands after my previous helmet needed to be retired. Some of them had nice features, but the Synthe is the best when it comes to being lightweight and aero. A great helmet is one that you don't notice on your head and this is it! Bonus points - super easy to tuck the shades in the holes while riding.

      Impact resistant

      • Familiarity: I've put it through the wringer
      • Fit: True to size

      Hit an unseen curb trying to get out of the rain. Front ejection and landed on my forehead. Not a scratch on me, not a scratch on the helmet. Great safety helmet. Comfortable.

      The perfect helmet!

      • Fit: True to size

      Light weight, aero, comfy, and ventilates well. My only gripe is on the roc-loc system is the tiny little plastic tabs/pins near the adjustment dial seem like they could break or wear out

      The new benchmark from Giro

      • Familiarity: I've put it through the wringer

      In the last year or so, new aero helmets such as the Giro Synthe ($250) and the Kask Protone ($300) have ushered in a new era in road helmet design. These helmets are more rounded-off at the tail, and more aero overall than previous top of the line, all-around, road helmets such as Giro's own Aeon and Specialized's Prevail.

      In addition, unlike older aero helmets, newer aero helmets such as the Synthe also ventilate well. Well done Giro!

      As for aerodynamics/quietness, if you compare the Synthe to previous top, all-around road helmets (Prevail, Aeon and before that, the Giro Ionos), helmets I rode in for years, there is no comparison. The Synthe is much quieter, especially when you put your head down during hammertime. The shaping at the tail of the old school helmets (Prevail/Aeon/Atmos/Ionos) is now obsolete.

      The new Giro Synthe and Kask Protone helmets are "game changers."

      Lastly, the ventilation of the Giro Synthe is different (and very effective). You actually feel the cool air running over your head -inside- the helmet (through the internal channels). This is brilliant. Does it vent *quite* as well as the Aeon or the Atmos? No. So, in >85/90° weather, I use my old white Summer helmet (Aeon). But in all other conditions, I much prefer the Synthe.

      Versus the Kask Protone, I like the looks of the Synthe more (totally personal). And the Synthe is less expensive.

      By the way... Greg van Avermat and Anna van Breggen won the men's and women's 2016 Olympic road race in Rio. And they were both wearing the Giro Synthe road helmet.

      Fantastic Helmet from Giro

      • Familiarity: I've put it through the wringer
      • Fit: True to size
      • Size Bought: Medium

      I came across the Giro Synthe helmet after several friends started raving about how fantastic of a helmet it is.

      I was first reluctant to buy a Giro helmet again since I have worn several helmets from Giro (Aeon, Air Attack, Atmos) and have never been a huge fan of their fit systems compared to other products such as Kask and Lazer. The Roc Loc Air system that was put into the Synthe is fantastic and allows me to easily adjust the helmet for when its cold and I need a thermal cap.

      The helmet is super light and ventilates very well in the summer. This is a huge benefit compared to other aero helmets such as the Air Attack and Specialized Evade. I cannot say I have noticed any significant aero benefits from this helmet, however its a nice piece of mind to know that this helmet has been tested to show its decently aerodynamic in comparison to other products.

      Since I bike in the Northeast in winter, I have taken some brutal falls on ice while wearing this helmet. One significant example is that I fell straight onto my head after my front wheel broke into some thin ice on the bike path. I expected to have a concussion after such a fall, but luckily I was wearing a good helmet and didn't sustain any damage. The helmet was scuffed up, but did not dent at all. Even so I need to replace it since it has been crashed.

      The only other product I recommend everyone research is the newer Giro Synthe MIPS helmet. I personally have never worn a MIPS system helmet, but I will be investigating this option for my upcoming helmet purchase.

      Great product, would buy it again!

      • Familiarity: I've put it through the wringer
      • Fit: True to size
      • Size Bought: Large

      Not as aero as the attack helmet, but great liner on the inside of the helmet.

      Adequate, safe, comfortable, minimalist

      • Familiarity: I've put it through the wringer
      • Fit: True to size
      • Size Bought: Large

      All helmets sold in the U.S. meet the same basic safety requirements, so after that it is style, flexibility, weight, and (if you believe in it) wind slipping. The helmet is adequate at all of that, except maybe flexibility. It comes with very little adjustability, but if it fits you won't care. And it fits me, much better than previous Giro helmets.

      I use this as a spare helmet, but I do use it on long rides. I just came in from a 5 hour winter ride and it was fine. Not as nice as my Kask or Catlike, but it is fine.

      If you want a fine helmet, go for it! If you want something special, there is a lot from which you can choose. But if the price is great on this, look it never hurts to have a spare helmet does it?

      Not a fan

      • Familiarity: I returned this product before using it
      • Fit: True to size

      I have a Giro Atmos and assumed this would fit well too, but the helmet hits the top of my head and the webbing is slack on top and comes too close to my ears. The chin strap buckle is positioned almost all the way to my right jawbone because unlike other helmets the straps don't slide in the back and instead are permanently attached. It looks nice on, but I don't think it would be comfortable for long rides unless I added extra padding on the top. I haven't ridden with it as I plan to return it, so can't comment on its aerodynamics.