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Synthe MIPS Helmet
Sale $143.74 - $239.95

Item # GIR00AA

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Item # GIR00AA

Your brain deserves the best protection.

The original Synthe was a ground-breaking helmet for Giro, combining the best of both aerodynamics and ventilation to create a lightweight helmet that slices through the air while keeping riders cool and comfortable. With the Giro Synthe MIPS Helmet, Giro follows the general trend in introducing the industry-leading Multi-Directional Impact Protection System (MIPS) safety technology into its top-end helmet.

The big draw with MIPS is its ability to reduce impact force and decrease concussion risk in the event of a crash. MIPS consists primarily of a strategically anchored, thin liner on the inside of the helmet that looks exceptionally simple, but serves a rather complex purpose. That little liner is designed to move independently of the helmet shell to essentially redirect impacts and reduce force on your brain compared to standard, non-MIPS helmets. If you do happen to crash, MIPS technology reduces your risk of concussion and dramatically increases your chances of walking away without a head injury.

On the outside, the Synthe retains all the awesome features that made its non-MIPS predecessor so well-loved in the peloton by cyclists like the US's own Phinney. Wind tunnel testing shows that it's more aerodynamic than the Aeon, while giant vents and Aero Mesh Panels funnel air across your dome for a massive cooling effect — a rare combination of fast and comfy.

Giro uses Featherweight Webbing straps with a Slimline buckle to hold the Synthe MIPS firmly in place without any of the pesky irritation or distractions that can plague thicker strapped helmets with bulky closure systems. The Roc Loc Air fit system features two-way fit tuning that's easily adjustable on the fly and is ponytail-compatible, making this helmet extra convenient for those of us with long hair. Giro even integrates eyewear docking ports into the Aero Mesh Panels for safe storage of your favorite sunglasses when the clouds come out to play.

Bottom line, the Giro Synthe MIPS Helmet brings together a tough-to-beat combination of wind-cutting speed, cooling temperature control, and top-line safety features to get you safely down the road.

  • An all-purpose aerodynamic road cycling helmet
  • Proven at the highest levels of cycling
  • In-Mold construction increases impact resistance
  • Adjustable fit cradle accommodates ponytails
  • Generous ventilation so "aero" doesn't mean stifling
  • An optics perch holds your glasses while you climb
  • Giro has set a new standard in understated, functional cycling design
Tech SpecsSize
Tech Specs
Shell Material
In-Mold polycarbonate
Impact Foam
25 Wind Tunnel vents, internal channeling, Aero Mesh Panels
Fit Adjustment
Roc Loc Air
Recommended Use
Manufacturer Warranty
1 year


Adult Cycling Helmets
Super Fit™
Head Circumference

18.5 - 20in

(47 - 51cm)

20 - 21.75in

(51 - 55cm)

21.75 - 23.25in

(55 - 59cm)

23.25 - 24.75in

(59 - 63cm)

24 - 25.55in

(61 - 65cm)

Head Circumference

21.25 - 24in

(54 - 61cm)

19.75 - 22.5in

(50 - 57cm)

22.75 - 25.5in

(58 - 65cm)

How to Measure:
For best results, use a tape measure to measure around your head where your hat would fit comfortably.

Reviews & Community


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Fit? perfect. Air flow? just okay

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

I have a good sized melon, and the large is a perfect fit. I looked at Pok helmets, but decided the styling was a bit odd. the Giro design felt like it would age better. This is my second Giro helmet, and the fit is similar. I'd say it's a more comfortable helmet than my previous one, with one exception. Maybe it's the nature of MIPS, but the air flow isn't as good. I'm getting used to it...or maybe the weather is just getting cooler. Overall, I'm very happy with it. Good purchase, no regrets.

Overlooked detail by designers

  • Familiarity: I returned this product before using it

I read reviews and was set to spent $200+ for a Giro Synthe MIPS helmet. Then, I tried one on. I couldn’t believe such an expensive helmet with incredible design features would have such a cheap chin strap. A nylon/polymer strap!!! The strap was uncomfortable and I would bet would be chaffing and irritating. I was expecting leather or at least synthetic leather. Needless to say, i’ll Choose a different helmet.

does the trick for road & gravel

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

Super comfortable, reliable Giro fit. Straps easy to adjust, fit wheel works well. Disappears on my head.

Works ok

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

It's a nice helmet for sure, but I expected a bit more. I've always had Giro helmets and it was time to replace my old one, so after looking around, I settled on the Synthe. I would have thought that a fairly high end helmet would have some significant improvements over the 10 year old model it was replacing, but... not really, besides maybe MIPS, although I hope I never put that to the test.

And, irritatingly, the smaller sweat pads seem to channel more sweat to the middle of my face/glasses/nose than the old helmet did.

GIro Synthe - love it but..

    I have been wearing the Giro Synthe helmet for years. It's great, looks good, is light, comfortable and not hot to wear. However, for the new MIPS version the Sythne in size small is smaller than the non-MIPS small. I have always worn a size small Sythne with a cycling cap under it. But this MIPS version of the Sythne is a smaller small, I can't wear a cap under it like I normal do. I had to return it.. Just fyi for those looking to replace their Sythne helmet in size small, like I was.

    Giro helmet

    • Familiarity: I've put it through the wringer
    • Fit: Runs small
    • Size Bought: medium

    I have used Giro synthe helmets for a few years. My last one's liner just cracked due to a crash so I replaced it with this MIPS system. Great helmet - ventilation is superb. You may need to go up a size because of the MIPS insert. I ordered a medium and had to return it for a large - no hassle from CC. My only issue is that no one seems to make the replacement padded insert which goes at the front of the helmet. The original pad is fine, but after washing off the sweat a few times, it falls apart.

    Seems like a great helmet

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

    I haven't actually used this quite yet, haven't been able to go for a ride yet this year, but looking forward to it! This seems like a really good helmet, incredibly lightweight and comfortable when I have just tried it on! Will update with more information when I get the chance to use it!

    How do you do one-hand fore-aft adjustment with the Roc Loc 5 Air fit system on the Synthe? I looked at it, and it's not obvious to me...

    Hi Aswin, The Rock Loc is adjusting the round dial at the back of the helmet.

    Great helmet

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

    I tried on the Zephyr and several others, and this one is very comfortable and easy to wear. Perfect helmet. Lightweight but his MIPS protection, and it'c comfortable.

    Lightweight Helmet

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

    I’ve used Giro for many years and never disappointed. At first I was a little skeptical about the MIPS due to fit issues, but once worn it feel nice and easy to adjust.

    Simply benchmark

      I love the Giro Synthe. I own both MIPS and non-MIPS versions now. I can confirm that the MIPS version fits just slightly, slightly smaller than the non-MIPS version. So if you're on the fence sizing-wise, go with the larger size.

      I love the aerodynamics and quietness of this helmet. If you compare the Synthe to previous top all-around road helmets (S-Prevail, Giro Aeon, Giro Ionos), helmets I rode in for years, there is no comparison. The Synthe is significantly quieter, especially when you put your head down during hammertime.

      By the way... Greg van Avermat won the Olympic Road gold and the 2017 Paris-Roubaix wearing... the Giro Synthe helmet.

      Light and looks good!

        I've tried several helmets this year, and I've landed on this one and am very happy. It looks pro because some of the racers in the world tour peloton use this helmet. It's lightweight and has the added bonus of being a MIPS helmet.

        Light and comfy

        • Familiarity: I've used it once or twice and have initial impressions
        • Fit: True to size
        • Size Bought: Large (24.5" circumference head)

        Initial ride was 5 hours, hot, humid, and rainy at times.
        6-12% grade hour long climb it didn't get too hot.
        10 minute 40mph descent it didn't get too windy.

        Superlight, well ventilated.

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

        When I first pulled this helmet out of the box, and saw almost no padding whatsoever inside and no extra padding in the box, I thought for sure that my review was going to end up being a negative one, and yet it isn't.

        Giro's current top end road helmet (I'm not counting the Vanquish aero helmet), is one of the lightest and most comfortable I've ever had the opportunity to wear, because while the padding is minimal, it's perfectly situated.

        A lightweight helmet is really important to me as well. I have degenerating discs in my neck, and relatively weak muscles. Because of this, any extra weight on my head can put stress on my neck muscles when trying to hold my head up in riding position. On today's inaugural ride in this helmet, I barely noticed the weight of the helmet at all.

        My lack of fitness, on the other hand, I noticed right away, and while there were lots of times I was struggling on the bike, none of them were neck related. To me right now, that's worth a 5-star review.

        And the added benefit of MIPS protection would bump it to a 6-star review if I had that option.

        Very Nice

        • Fit: True to size
        • Size Bought: Small

        The helmet was awesome in every way but was too small so I returned it. I purchased it on sale, size small (clearance?) and it's definitely worth it if you have a small head.

        One of the Best!

        • Familiarity: I've put it through the wringer

        Bought this helmet as a gift. Here is what they had to say about it - "One of the best helmets I have ever used. The fit is great and the ventilation is really awesome. Very comfortable even after hours in the saddle. I've been using this helmet for road rides, road races, and cx races. Love knowing I have the extra protection of MIPS."

        An excellent helmet!!!

        • Fit: True to size
        • Size Bought: small

        I used this helmet for a year and a half to two years and it has been exceptional. The small size fit my 21.5" head perfect and when I recently had a bike crash it kept my head safe and it did not move from it's original position at all.

        Synthe MIPS

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

        I loved my original Synthe Titanium and rode it for several seasons. Had to replace it after a crash in the fall and decided to upgrade to the MIPS for extra safety. Fits exactly the same as the original and breathes just as well. I don’t plan to ever switch from this helmet except for future renditions. Couldn’t care less about the Aero claims, but I guess it’s a plus.

        Nice Helmet

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

        I couldn't decide if I wanted to put that much money in a helmet, but I am glad I did. Researched several different helmets and finally decided on the Giro Synthe MIPS. I have been wearing a Giro Atmos II and wanted to get a helmet with MIPS. It is one of the most comfortable helmets I have worn and is very easy to adjust. The helmet looks great and I could not be more pleased.

        Synthe MIPS Titanium

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

        Great colour. Helmet is nice and light. I also have a Foray and this fits the same. The Synthe is a beautiful helmet and has MIPS but I'd have to say the cheaper Foray is much the same as the Synthe and way better value. I had a crash with a Foray and wrote the helmet off but my head was good and the Foray didn't have MIPS. Personally I'm not so sure that MIPS is the great miracle life saver but maybe it is.