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GiroSyntax MIPS Helmet


Item # GIR00K3

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  • Matte Black, S ($119.95)
  • Matte Midnight Bars, L ($119.95)
  • Matte Midnight Bars, S ($119.95)
  • Matte White/Silver, S ($119.95)
  • Matte White/Silver, M ($119.95)
  • Matte White/Silver, L ($119.95)
  • Matte White/Silver, XL ($119.95)
  • Matte Black/Bright Red, S ($119.95)
  • Matte Black/Bright Red, M ($119.95)
  • Citron/White, S ($119.95)
  • Citron/White, L ($119.95)
  • Hightlight Yellow/Black, S ($119.95)
  • Hightlight Yellow/Black, M ($119.95)
  • Hightlight Yellow/Black, L ($119.95)
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Item # GIR00K3

Syntax MIPS Helmet

With the Syntax MIPS Helmet, Giro manages make a sleek and stylish helmet that offers deeper coverage for the sides and back of the head, generous ventilation, MIPS technology, and a slim profile—all at a price that shows advanced head protection doesn't need to cost a fortune.

Giro achieves this using their In-Mold construction process that fuses a tough polycarbonate shell to impact-absorbing EPS foam while inside the mold, creating a strong helmet that has extensive coverage and improved ventilation without any excess bulk. On the inside of the EPS liner, Giro incorporates their Roc Loc 5 Air MIPS retention system for a highly adjustable fit that delivers great stability and long range comfort. By integrating MIPS with the retention system, Giro improves the overall fit without sacrificing the ability of the MIPS system to disperse rotational forces in the event of an angled impact.

With 25 Wind Tunnel vents that channel incoming air over and around your head while pushing hot and stale air out, the Syntax MIPS stays cool even when pushing your limits on warmer days. Additionally, the CoolFit anti-microbial padding effectively manages sweat to further aid in keeping you cool, all while resisting odor build-up over time.

  • A cycling helmet that blends style, function, and value
  • Sleek design offers extra coverage without extra bulk
  • In-mold construction enhances durability and ventilation
  • Roc Loc 5 system allows a comfortable, secure, adjustable fit
  • Integrated MIPS can help disperse rotational impact forces
  • Wind Tunnel vents channel airflow to keep you cool
  • Anti-microbial padding manages sweat and odor
  • Ages 5 and older

Tech Specs
Shell Material
Impact Foam
25 Wind Tunnel vents
Fit Adjustment
Roc Loc 5 Air MIPS
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.

View more Road Helmets

    What do you think about this product?


    >Rating: 5

    Great road helmet in every way

    I've used it once or twice and have initial impressions
    True to size
    Size Bought
    165 lbs

    Just purchased the white/citron Syntax in size M. Prior helmet was a Giro Saros, a good helmet which lasted until I could no longer order replacement sweat pads. I was already a fan of the Roc Loc retention system, and the Saros had good ventilation. Here's what I like even better about the Syntax: 1. MIPS! 2. Fit - the Syntax is a deeper helmet, it covers more of your head and fits better as a result. With the Rock Lock adjusted properly, it does not move when I shake my head from side to side - even without the chin strap. 3. Straps - made of a thinner and lighter webbing, they secure the helmet better and more comfortably than the Saros did. 4. Color - the white/citron looks cool and adds visibility. No matter what kit I wear, my socks and gloves are high vis yellow and this matches. The helmet seems to be slightly heavier than the Saros, but not by much. Honestly - when I'm riding, I barely feel the helmet and that's as good as it gets.

    >Rating: 4

    too round

    True to size
    Size Bought

    There is nothing wrong with this helmet but I don't like how it looks on my head. It is very round and I am looking for a more streamlined look and have decided I want a visor as well. So I will return this helmet and order the Hex. The fit is perfect and I love how the dial helps to fit the helmet for each head.

    >Rating: 5

    Syntax helmet

    I've put it through the wringer
    Runs small
    Size Bought
    large - the MIPS insert adds volume so you may have to go up a size (I used mediums in the pre MIPS version
    5` 10"
    154 lbs

    I have used Giro's synthe helmets for a few years - great ventilation, but very expensive. I crashed recently and needed a new helmet. So I tried this model. Half the price and better in my opinion. Fits better, padding much better than on the Synthe. Great ventilation, but with that comes a price - very noisy, especially if you ride on windy days. Light weight.

    >Rating: 5

    Terrific for Tall Heads

    I returned this product before using it
    True to size
    Size Bought

    My head isn't so much large as tall, and I've always struggled to find helmets that fit: large sizes are wobbly, and anything smaller tends to sit on the top of my head like a bottle cap. This helmet, though, is perfect—comfortable, with adequate coverage for my tall-above-the-ears head (despite a relatively low profile), and easy to dial into position. I ended up returning it, but only because I bought a Giro Vanquish at the same time which fit similarly well, and I opted not to keep both. If I were to give up the Vanquish, I'd be back to the Syntax in a heartbeat. Highly recommended.

    >Rating: 5

    Great helmet

    I've used it several times
    True to size
    Size Bought
    Large and XLarge
    5` 6"
    152 lbs

    I've had 4 helmets before this one. My previous ones seemed to sit on top of my head and not come down far enough even though they were a large. I was looking at a Bontrager Spectre but I had braids installed and even a large wouldn't fit. And it was an extra $50. The XL size of this fits perfectly. I purchased a L as well when I'm without braids. It's a good price. It fits very well. And I like the adjustments.

    I'm so glad to see a post about braids! I had to return my last helmet because of bigger hair, and glad to know I'm not alone :D


    My head measures 59cm. 59cm is at the end of the range for medium and the start of the range for a large. I’ve always worn medium helmets but never owned a giro lid. Which size would be most appropriate?

    My head measurements are 59 also. I ordered the large. It feels just slightly too large. I have a medium on the way. I’ll let you know if you haven’t already purchased.

    I would like to know also.

    >Rating: 5


    I've used it several times
    True to size
    Size Bought

    Being afraid of how bulky a helmet was going to look on me; I looked at many styles. Ordered this one for its sleek look and once it arrived and i tested it out; I love it so much more! Sleek, light & comfortable!

    >Rating: 5

    Light & fits well

    I've put it through the wringer

    Love the fit of the it! Very light but feels secure and durable.