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Giro Synthe MIPS Helmet

Sale $188.95 - $269.95

Item # GIR00AA Past Season Colors

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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 Specs

Shell Material:
In-Mold polycarbonate
Impact Foam:
25 Wind Tunnel vents, internal channeling, Aero Mesh Panels
Fit Adjustment:
Roc Loc Air
Claimed Weight:
[medium] 270 g
Recommended Use:
Manufacturer Warranty:
1 year

Size chart


Adult Cycling Helmets
 SS/MMM/LLXLAdult UniversalWomen's Universal
Head Circumference 20 - 21.75in
(51 - 55cm)
20 - 22.5in
(51 - 57cm)
21.75 - 23.25in
(55 - 59cm)
21.75 - 24in
(55 - 61cm)
23.25 - 24.75in
(59 - 63cm)
24 - 25.55in
(61 - 65cm)
21.25 - 24in
(54 - 61cm)
19.75 - 22.5in
(50 - 57cm)
Head Circumference 20 - 20.75in
(51 - 53cm)
21.25 - 22in
(54 - 56cm)
22.5 - 23.25in
(57 - 59cm)
23.5 - 24.25in
(60 - 62cm)
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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absolutely love it!

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

Firstly, it is the most comfortable helmet I have ever used and I ride year round in Arizona. Secondly, I got to personally crash test this helmet at 40mph. No head truma. The whole inner web works just as advertised! So glad I was wearing this helmet. When it comes to protecting the gray matter between your ears this is helmet is worth every penny.

Avg. ride time: 1h 59m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Giro Synthe MIPS

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

excellent fit,comfortable,definitely as efficient cooling as previous helmets

Great Helmet

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

This is my first Synthe and my first helmet with MIPS. NOT my first Giro, tho. Giro helmets have always fit me well and this one is no exception. It seems to have a bit less wind noise than others I have owned (Atmos, Spec Piranha, original Giro with the lycra cover). This helmet seems a bit more aero, but that's a lil hard to tell, really. I've not worn this on super hot, humid days yet, so can't speak to the a/c factor. Definitely seems to be worth the money at this discounted price.

Comfortably protect that dome

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

The fit on this helmet is awesome. It literally fits like a second skin.
I was a little freaked out with the lighter gauge material on the straps. However, after using the helmet for a few rides the straps just disappear. I completely forget there’s a helmet on my head. Once adjusted properly they are very comfortable.
Other people have commented that the helmet is a little warm. I don’t find that to be the case. Perhaps it’s because I use Headsweats under my helmet to keep the sun off of my scalp. The cooling seems to be about the same or better than my previous Giro Ionos helment.


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

I have had the MIPS and regular Synthe and they were great. I was hit by a car from behind and barrel rolled and the ambulance drive said it aill, the helmet saved your life--the nurse in the ER wanted to know the band so she could buy the same model. I was wearing the MIPS and I can't say enough good things--no concussion or head trauma. BEST HELMET.


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

    I wear my MIPS version in the Fall/Winter/Spring. I wear my non-mips version (in white) in the Summer.

    I love the aerodynamics and quietness of this helmet. If you compare the Synthe to previous top, all-around road helmets (Spesh Prevail, Giro Aeon and before that, the 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 and Anna van Breggen won the men's and women's 2016 Olympic road race in Rio. They were both wearing the Giro Synthe helmet.

    Giro Synthe Mips

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

    Great helmet, still keeps the head cool. the Ionis feels a bit more comfortable. I guess a touch less comfort is a small price for the increase in safety if the bean hits something.

    Avg. ride time: 1h 39m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Pay attention to sizing

    • Familiarity: I've put it through the wringer

    1 - I usually run a Small non-MIPS Synthe so ordered the same for this one, but it's too small. The MIPS mechanism really does take extra space so size up appropriately if your on the upper end of a size.
    2- As mentioned in other reviews, the MIPS version does suffer on the air circulation side, so it is warmer.

    All in all, not sure that the MIPS is worth it, the human scalp also offering a natural slip plane in case of a crash.

    comfortable but warm

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

    Very comfortable helmet but warmer than previous Giro helmets that I have used. The thick brow pad was getting soaked with sweat and felt like a warm sponge on my forehead so I actually took it out and cut up four small pieces of felt to cover the velcro attachment spots which made the helmet cooler.

    Avg. ride time: 2h 56m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Cool? but warmer than Synthe w/o MIPS

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

    I love both my Giro Synthe helmets and I like the idea of the additional safety the MIPS technology provides. BUT, MIPS puts an additional thin clear layer of plastic inside the shell and I have noticed that on hot days, this helmet just doesn't have the same airflow as the Synthe original.

    Cool?  but warmer than Synthe w/o MIPS

    Stephan D. - Do you feel as if both versions of the Synthe helmet fit the same? Do you notice any difference in feel when wearing the MIPS helmet?

    Dave Byers: The fit on both feel the same as the internal "skeleton" is exactly the same. The MIPS version simply has another layer of thin clear plastic between the skeleton and the styrofoam shell of the helmet. Because this additional layer sits between the two it reduces the airflow betwen your head and the helmet.

    Visible and Fashionable ;)

    • Familiarity: I gave it as a gift but have feedback to share

    More feedback to share from my mom. I need to stop buying her stuff ;)

    Snug fit, my pony tail flies freely out one of the back vents--very important! Sizing was a breeze, & it accommodates my Tifosi and Giro sunglasses without a problem--worn individually of course. :D

    Last and best aero helmet

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

    This is my second purchase of the Synthe. It is for my wife who is stepping up to a full distance Ironman event this summer. I have been riding with my Synthe for over a year. Its the best combo of comfort, weight and cools better than any other helmet

    Avg. ride time: 2h 41m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Cool, safe and slick

    • Fit: True to size
    • Size Bought: Medium

    The reason I wear a helmet is for safety. I wanted a helmet with the new MIPS protection system as if its safer, then I want it asap. I purchased a Giro Savant MIPS helmet because at the time it was one of the very few Giro helmets with MIPS. I loved the fit but I found the helmet to be hot to wear in the summer. I didn't expect to see the Synthe MIPS on the market until the fall but Competitive Cyclist got it earlier in August so I bought it. According to what I read, the Giro Aeon was Giro's best ventilated helmet but was not available with MIPS. The Synthe MIPS was supposed to have better ventilation than the Aeon. The AEON cost about $200 so the Synthe MIPS at $269 with an even better ventilation system plus MIPS seemed to be a "reasonable" value. The aero aspect of the Synthe MIPS is just an added bonus for me. Ok, how do I like it.

    I generally like the helmet. Its comfortable and yes its cooler than the Savant. I wear a headsweat when I ride so I can't feel the air flowing through the helmet but its better than the Savant. It also feels lighter leading to less post ride sore necks.

    The chin strap is a chin strap. It takes a little work to adjust it to the right length but once I got it, I just strap on the helmet and ride. No problems so far. I might have designed it differently for a top of the line helmet but its just a chin strap.

    Does the MIPS work? Lets hope I never have to find out but I feel better knowing that I have a high quality helmet with safety as my first concern.

    Can I feel that its more aerodynamic? How could anyone tell without a wind tunnel.