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Giro Synthe MIPS Adult Road Cycling Helmet

4.7 4.7 out of 5 stars 278 ratings
Price: $136.19 Free Return on some sizes and colors
Free 7-day try-on available for some sizes and colors.
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Matte Black

Size Chart
US Mips cycling helmet
Brand SizeHead Circumference (in)
S20.1 - 21.6
M21.6 - 23.2
L23.2 - 24.8
XL24.8 - 25.6
Brand Giro
Color Matte Black
Age Range (Description) Adult
Size Small (51-55 cm)
Special Feature Compact

About this item

  • 26 Wind Tunnelvents with internal channeling
  • Roc Loc Air Fit System
  • Thermoformed SL Roll Cage reinforcement
  • In-mold polycarbonate shell with EPS liner
  • Ponytail compatible
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Product Description

The Synthe is the pinnacle of road helmet design, combining the performance gains of an aerodynamic profle and light weight with great cooling power to enhance rider comfort and effciency in road rides and races. The compact form slips through the air with ease across multiple yaw and head angles, and offers greater cooling power than the Aeon. Key features include the Roc Loc Air ft system with 2-way ft tuning and Aero Mesh Panels with a dedicated port for securely docking sunglasses as you ride

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
278 global ratings

Customers say

Customers like the fit, quality, weight and appearance of the sport helmet. For example, they mention it fits nicely, it's well vented and it looks sharp. That said, some are satisfied with noise, and safety. That being said, opinions are mixed on the value.

AI-generated from the text of customer reviews

61 customers mention56 positive5 negative

Customers like the fit of the helmet. For example, they say it fits nicely, is easy to adjust, and has a MIPS rating. Some mention that the appearance is stylish and is not too large.

"...Looks really cool when wearing it, compact size so you don't look like a mushroom, lightweight, well vented and considerably silent at high speeds...." Read more

"...Ventilation is excellent, the appearance is stylish and is not too large...." Read more

"...The strap is light, holds well, and fits very comfortably around the side of the face and under the chin...." Read more

"...It is a work of art. The fit is amazing compared to the cheaper helmets. On my ride, I perceived a more aero feel than the old helmets...." Read more

53 customers mention53 positive0 negative

Customers are satisfied with the quality of the helmet. They mention that it is well constructed, lightweight, and has a MIPS rating. Some say that the fit runs a little small or tight.

"...it, compact size so you don't look like a mushroom, lightweight, well vented and considerably silent at high speeds...." Read more

"This helmet is comfortable, light weight, and well constructed. Ventilation is excellent, the appearance is stylish and is not too large...." Read more

"...The strap is light, holds well, and fits very comfortably around the side of the face and under the chin...." Read more

"...storage holes for sunglasses proves useful and holds the glasses a little more securely then when using a normal vent...." Read more

36 customers mention36 positive0 negative

Customers like the weight of the sport helmet. They mention it's very light, and comfortable.

"...when wearing it, compact size so you don't look like a mushroom, lightweight, well vented and considerably silent at high speeds...." Read more

"This helmet is comfortable, light weight, and well constructed. Ventilation is excellent, the appearance is stylish and is not too large...." Read more

"...The strap is light, holds well, and fits very comfortably around the side of the face and under the chin...." Read more

"...The MIPS idea is a long time coming! The helmet is extremely light! Well worth the big bucks!" Read more

33 customers mention33 positive0 negative

Customers are satisfied with the comfort of the sport helmet. For example, they mention it fits well, has good adjustments, and does not cause pain on long rides.

"...layer(it leaves 1 or 2 clicks for the roc loc) but for me it feels more comfortable and with a better adjustment...." Read more

"This helmet is comfortable, light weight, and well constructed. Ventilation is excellent, the appearance is stylish and is not too large...." Read more

"...The helmet is feather-light and VERY comfortable...." Read more

"...It fits well and is very comfortable; it replaces a previous Giro I damaged in an endo!..." Read more

30 customers mention30 positive0 negative

Customers are satisfied with the appearance of the helmet. They mention that it looks sharp, has a nice low profile, and is well designed. Some say that the color is great looking.

"...Looks really cool when wearing it, compact size so you don't look like a mushroom, lightweight, well vented and considerably silent at high speeds...." Read more

"...Ventilation is excellent, the appearance is stylish and is not too large...." Read more

"...Also, the Synthe is aero but has great ventilation, and aesthetically is really cool looking...." Read more

"...It arrived today. Out of the box, this helmet looks better than in the pictures. It is a work of art...." Read more

27 customers mention27 positive0 negative

Customers like the noise level of the sport helmet. They mention that it has great air ventilation, and breathes well. They also appreciate the ventilation gaps that hold their glasses while climbing and don't create extra wind noise. Overall, most are happy with the noise performance of the helmet.

"...don't look like a mushroom, lightweight, well vented and considerably silent at high speeds...." Read more

"...Ventilation is excellent, the appearance is stylish and is not too large...." Read more

"...Also, the Synthe is aero but has great ventilation, and aesthetically is really cool looking...." Read more

"...out later (since we purchased w/out ever riding w/it) that it has amazing air flow that keeps your head cool...." Read more

11 customers mention11 positive0 negative

Customers are satisfied with the safety of the helmet. They mention that the MIPS insert is an added benefit, it's very safe to wear, and protects the head well. Some say that the helmet was destroyed but their head was not injured.

"...Obviously MIPS is an added safety benefit but not a must have for me.Don't assume it will fit like your old Giro...." Read more

"...It’s lightweight and pretty aero. The MIPS system is a nice safety feature. There are two holes in the front that are designed to hold sunglasses...." Read more

"This is a very comfortable helmet ... and with MIPS, very safe...." Read more

"...helmet, fits comfotable on my head and its MIPS rating makes it very safe to wear...." Read more

18 customers mention9 positive9 negative

Customers have mixed opinions about the value of the sport helmet. Some find it well worth the price, while others say it's overpriced based on quality.

"...The helmet is extremely light! Well worth the big bucks!" Read more

"...The helmet is on the pricey side, but I chose to go with it anyway due to the quality of the product, and attention to detail on all the components...." Read more

"...The price is very competitive. The packaging was good to ensure that the helmet arrived in perfect condition...." Read more

"...Lastly, we feel it's a bit over priced." Read more

Awesome Aero helmet with safety in mind.
5 Stars
Awesome Aero helmet with safety in mind.
This is a great helmet, I have the regular Synthe and bought this one because of the MIPS improvement. In the previous model I am almost at the higher limit for the size M, it leaves 3 or 4 clicks of adjustment in the roc loc. The Synthe model has a little bit snugger fit because of the MIPS layer(it leaves 1 or 2 clicks for the roc loc) but for me it feels more comfortable and with a better adjustment. Looks really cool when wearing it, compact size so you don't look like a mushroom, lightweight, well vented and considerably silent at high speeds. My only complain to Giro would be that so far there is no Roc Loc Air replacement for the Mips model.UPDATE: After 3 months owning this beauty, I had a bad crash, broke a couple of ribs and hit my head pretty hard. The helmet broke, but I had no harm in my head at all, this helmet probably saved my life. I'm one month off the saddle for now but I'm getting exactly the same helmet as replacement. I just hope to get a $180 deal as the one I got when I bought the first one instead of the full $269 price LOL. USE YOUR HELMET.
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Top reviews from the United States

Hector Solano Espinoza
5.0 out of 5 stars Awesome Aero helmet with safety in mind.
Reviewed in the United States on January 20, 2017
Verified Purchase
This is a great helmet, I have the regular Synthe and bought this one because of the MIPS improvement. In the previous model I am almost at the higher limit for the size M, it leaves 3 or 4 clicks of adjustment in the roc loc. The Synthe model has a little bit snugger fit because of the MIPS layer(it leaves 1 or 2 clicks for the roc loc) but for me it feels more comfortable and with a better adjustment. Looks really cool when wearing it, compact size so you don't look like a mushroom, lightweight, well vented and considerably silent at high speeds. My only complain to Giro would be that so far there is no Roc Loc Air replacement for the Mips model.

UPDATE: After 3 months owning this beauty, I had a bad crash, broke a couple of ribs and hit my head pretty hard. The helmet broke, but I had no harm in my head at all, this helmet probably saved my life. I'm one month off the saddle for now but I'm getting exactly the same helmet as replacement. I just hope to get a $180 deal as the one I got when I bought the first one instead of the full $269 price LOL. USE YOUR HELMET.
Customer image
Hector Solano Espinoza
5.0 out of 5 stars Awesome Aero helmet with safety in mind.
Reviewed in the United States on January 20, 2017
This is a great helmet, I have the regular Synthe and bought this one because of the MIPS improvement. In the previous model I am almost at the higher limit for the size M, it leaves 3 or 4 clicks of adjustment in the roc loc. The Synthe model has a little bit snugger fit because of the MIPS layer(it leaves 1 or 2 clicks for the roc loc) but for me it feels more comfortable and with a better adjustment. Looks really cool when wearing it, compact size so you don't look like a mushroom, lightweight, well vented and considerably silent at high speeds. My only complain to Giro would be that so far there is no Roc Loc Air replacement for the Mips model.

UPDATE: After 3 months owning this beauty, I had a bad crash, broke a couple of ribs and hit my head pretty hard. The helmet broke, but I had no harm in my head at all, this helmet probably saved my life. I'm one month off the saddle for now but I'm getting exactly the same helmet as replacement. I just hope to get a $180 deal as the one I got when I bought the first one instead of the full $269 price LOL. USE YOUR HELMET.
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Customer imageCustomer image
17 people found this helpful
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Mark and Jill
5.0 out of 5 stars Quality
Reviewed in the United States on August 2, 2017
Verified Purchase
This helmet is comfortable, light weight, and well constructed. Ventilation is excellent, the appearance is stylish and is not too large. I also love the sunglass holding ports, which is the first time that I have had that feature in a helmet, and while not too excited about it before I bought it, I found that it is extremely useful. The helmet is on the pricey side, but I chose to go with it anyway due to the quality of the product, and attention to detail on all the components. I can't speak to its durability from a crash (knock on wood) since I have not had one with this helmet, but Giro is a reputable company that invests in R&D and testing of their products.
6 people found this helpful
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Raul Sanchez
5.0 out of 5 stars and fits very comfortably around the side of the face and under the ...
Reviewed in the United States on November 9, 2017
Verified Purchase
This is my second Giro Synthe helmet, but the first MIPS equipped one. I cracked the first non-MIPS helmet when I crashed a couple months ago. Luckily, I did not sustain any head injuries and this was evidenced by a CT Scan. The harness works extremely well both during warm weather and during the cold when wearing a skully. It's also a breeze to adjust the fit with the single dial in the back. The strap is light, holds well, and fits very comfortably around the side of the face and under the chin. Also, the Synthe is aero but has great ventilation, and aesthetically is really cool looking. The Giro Synthe has been nothing short of excellent, and I'm very happy to have purchased it.
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David
5.0 out of 5 stars Super comfy, lightweight and easy to adjust.
Reviewed in the United States on January 16, 2017
Color: Matte Black (2020)Size: Large (59-63 cm)Verified Purchase
This is one of those items where the cost is quite off putting when in the research phase but then once you have used it there is no going back - like a Mac! The differences between this and cheaper Giro helmets are huge (I have the Savant and the Phase). I can't account for its true aero capabilities but there is definitely less buffeting from the wind so that has to count for something! The straps are a big improvement and the RocLoc tensing system continues to be a good system for me. The dedicated storage holes for sunglasses proves useful and holds the glasses a little more securely then when using a normal vent. At this price it would be nice if the helmet came with a storage bag but overall Im very happy with my purchase.
One person found this helpful
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Amazon Customer
5.0 out of 5 stars Wow - I am glad I moved up to this helmet!
Reviewed in the United States on June 10, 2020
Verified Purchase
I have been road biking for a couple of years now. My previous helmets were less expensive Giros. I researched scores of helmet brands and found it difficult to decide because there are so many good helmets. I was thinking about the much more expensive Giro Aether when I saw a review from a rider that had experienced both the Synthe and the Aether. He liked the Aether but said he said that nothing is really gained when moving from the Synthe to the Aether. In his Aether review, he recommended the Synthe.

I was not very impressed with the looks and colors of many of the expensive helmets. Not even the Giro Aether had the color scheme I wanted. I almost purchased a black one. Then I found this helmet - saw the color scheme and made an immediate purchase.

It arrived today. Out of the box, this helmet looks better than in the pictures. It is a work of art. The fit is amazing compared to the cheaper helmets. On my ride, I perceived a more aero feel than the old helmets.

This helmet was a great find. Finally, the hunt for a decent helmet is over.
3 people found this helpful
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Chris N.
4.0 out of 5 stars Great fit, doesn't hold most sunglasses well
Reviewed in the United States on November 10, 2021
Verified Purchase
Best fit I've ever had. Matte finish is already wearing off. Glasses holes only keep very specific glasses in place, specifically ones with straight arms, and even then it's hit or miss. Giro offers zero guidance on this, only saying that most any will fit, which is BS. Otherwise I love it, and bought a spare pad set so I can use it for years to come. (Shame on Giro for not selling those directly, or supporting obsolete helmets.)

Industry-wide gripe: why not use double D-ring chin straps like notorcycle helmets instead of the plastic crap? Perfect fit every time and virtually unbreakable. Just sayin'.
One person found this helpful
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Gerald Wigmore
5.0 out of 5 stars Keeps my head nice and cool!
Reviewed in the United States on August 12, 2019
Verified Purchase
Bought this same helmet (in black) for my wife at local bike store (a week earlier), but they didn't have my size (M) or the olive/hi-viz color that I liked. This was the most expensive helmet at the bike store, so we said let's try it on just to see what the best feels like before we choose a more value-oriented model. Well the difference was so staggering, compared to the other models available, we ended up buying this one (and a 2nd here on Amazon for me)! The helmet is feather-light and VERY comfortable. And best of all we found out later (since we purchased w/out ever riding w/it) that it has amazing air flow that keeps your head cool. We are casual riders (I have a Priority Continuum Onyx commuter bike) i.e. not long distance riders so at first thought this helmet was overkill, but decided why not be as comfortable as possible so we paid-up a bit (vs our orig budget) and have NO regrets!
3 people found this helpful
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M. Prince
5.0 out of 5 stars If the helmet fits...
Reviewed in the United States on June 25, 2019
Verified Purchase
This is my second Giro Synthe. The first one lasted three years and protected me in a minor crash, so I gladly replaced with a new unit. The Synthe fit works for me, but I also appreciate that the straps sit flush against the side of my head and don't create extra wind noise, the locking mechanism is easy to use, my glasses fit securely in the vents, I can wear the helmet with or without a cap, and the helmet looks pretty good, too - without a lot of swoops or gratuitous "aero" flourishes. It's a quality product that does exactly what it promises to do.
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Top reviews from other countries

Colinc
5.0 out of 5 stars One of the best helmets👍
Reviewed in the United Kingdom on December 1, 2022
Color: Matte Dusty Purple Heatwave (2019)Size: Small (51-55 cm)Verified Purchase
Great fit can wear it all day super vents for keeping cool 5*+ helmet.
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Jeff Lem
5.0 out of 5 stars Great Helmet
Reviewed in Canada on September 22, 2017
Color: Matte Black (2020)Size: Large (59-63 cm)Verified Purchase
Very comfortable and while it is a little bulkier than my old Bell helmet - feels more safe. I had originally ordered the M size but found it too tight so returned it no problem and re-ordered the L size which fits great. Was originally concerned that with the black colour and fewer vents that the helmet would wear hotter and so far after two dozen rides not noticing any increase in heat. Product is well made and the headband adjustment works well. Would definitely recommend this product despite being the most expensive helmet I ever purchased.
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