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Giro Synthe MIPS Review

A lightweight helmet with excellent all-around performance and a comfortable fit for large heads
Giro Synthe MIPS
Photo: Giro
Top Pick Award
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Price:  $240 List | $215.95 at Amazon
Pros:  Lightweight, comfortable, low profile, good ventilation
Cons:  Expensive
Manufacturer:   Giro
By Nick Bruckbauer ⋅ Senior Review Editor  ⋅  Oct 2, 2019
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79
OVERALL
SCORE


RANKED
#4 of 16
  • Comfort - 20% 9
  • Adjustability - 15% 8
  • Weight - 15% 8
  • Style - 15% 8
  • Ventilation - 20% 7
  • Durability - 15% 7

Our Verdict

The Giro Synthe MIPS combines class-leading comfort and adjustability in a surprisingly lightweight package, earning it another spot near the top of our awards podium. With a semi-aerodynamic design and good ventilation, the Synthe stands out in a sea of high-end products, earning solid overall scores in every rating metric. Although other models may do a better job meeting specific needs for a more aerodynamic profile or better ventilation, few other models stack up when it comes to all-around performance. Riders looking for a single helmet for training or racing in any conditions would certainly be pleased with the Giro Synthe.

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Giro Synthe MIPS
This Product
Giro Synthe MIPS
Awards Top Pick Award Editors' Choice Award Editors' Choice Award Top Pick Award Best Buy Award 
Price $215.95 at Amazon$210 List$170.95 at Amazon
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Pros Lightweight, comfortable, low profile, good ventilationLightweight, comfortable, well-ventilated, easy to adjust, high visibility color optionsWell-ventilated, adjustable and comfortable, sleek and classy styleVentilates well, comfortable, unique style, sunglass garageComfortable, adjustable, durable, inexpensive
Cons ExpensiveExpensive, high volume shapeSlightly heavy for a high-end helmetExpensiveHeavier, slightly less ventilation
Bottom Line A lightweight helmet with excellent all-around performance and a comfortable fit for large headsAn extremely comfortable, well-ventilated, and lightweight helmet with minimal wind roar for all-day riding and steep climbingA very comfortable, well-ventilated helmet with plenty of high-end features and a classy styleThis uniquely designed helmet offers excellent airflow and performance that warrant its high costA very comfortable helmet full of high-end features at a surprisingly low price
Rating Categories Giro Synthe MIPS Bontrager Velocis MIPS Bell Z20 MIPS POC Ventral Air Spin Giro Agilis MIPS
Comfort (20%)
9.0
9.0
9.0
8.0
8.0
Adjustability (15%)
8.0
8.0
9.0
7.0
9.0
Weight (15%)
8.0
8.0
6.0
8.0
6.0
Style (15%)
8.0
7.0
9.0
7.0
5.0
Ventilation (20%)
7.0
9.0
8.0
9.0
5.0
Durability (15%)
7.0
8.0
7.0
9.0
9.0
Specs Giro Synthe MIPS Bontrager Velocis MIPS Bell Z20 MIPS POC Ventral Air Spin Giro Agilis MIPS
Weight (grams) 312 g (size L) 300 g (size L) 336 g (size L) 295g (Size L) 336 g (size L)
Size Range (cm) 59-63 cm (size L) 58-63 cm (size L) 58-62 cm (size L) 56-61 cm(size L) 59-63 cm (size L)
Number of Vents 19 12 18 15 32
MIPS Yes Yes Yes No, SPIN Yes
Sizes S, M, L S, M, L S, M, L S, M, L S, M, L

Our Analysis and Test Results

The Giro Synthe MIPS seems to be able to do it all. It has the right amount of padding in just the right places, is easily adjustable for an optimum fit, and balances a good amount of ventilation with a semi-aerodynamic profile; all rolled into a lightweight package. As with most newer top-end helmets, it has a built-in MIPS liner for additional crash safety, and also comes with Giro's awesome Roc Loc Air fit system to help dial in a cool and comfortable fit. All these premium features without any glaring weaknesses help the Synthe MIPS earn another spot on our awards podium.

Performance Comparison


The Synthe strikes a nice balance with one of the lightest weights...
The Synthe strikes a nice balance with one of the lightest weights in the lineup and a semi-aerodynamic shape.
Photo: Nick Bruckbauer

Comfort


While helmet comfort is certainly dependent on individual user preferences, the Synthe MIPS has several important features that help make it comfortable for a wide variety of head shapes and sizes. All of our testers consistently rank it among the most comfortable helmets in our lineup.


The Synthe MIPS features Giro's Roc Loc Air fit system with a full circumference adjustable headband that is designed to cradle the head and keep a small gap between the head and the EPS foam liner material. This helps promote airflow inside the helmet and allows more flexibility for a customizable fit without bumping your head into the foam liner. This system creates a nice balanced fit around the head that helps eliminate any pressure points against the harder foam. The padding is minimal compared to some other models, but is positioned well and complements the other design features to make for a very comfortable fit.

The XStatic Pads along with the full circumference headband make for...
The XStatic Pads along with the full circumference headband make for a very comfortable, cradled fit.
Photo: Nick Bruckbauer

The chinstrap system and adjustable Y-buckle are very well-designed and lay flat against the face, and the webbing material used for the straps is thin, supple, and very comfortable. Our testers love the small unobtrusive Y-buckle, which is barely noticeable while riding. Easily being able to dial in the correct tension helps keep the helmet properly positioned on your head for a consistently comfortable fit throughout your ride.

The Roc Loc Air Fit system has a full circumference adjustable...
The Roc Loc Air Fit system has a full circumference adjustable headband that supports the head and allows airflow between the head and the EPS foam liner.
Photo: Nick Bruckbauer

Adjustability


The headband system has a 2 cm range of fore/aft adjustability.
The headband system has a 2 cm range of fore/aft adjustability.
Photo: Nick Bruckbauer
The Synthe MIPS offers a very high level of adjustability. The internal Roc Loc Air Fit system can be adjusted to fit a variety of head shapes and circumferences, ranging from 55-59 cm in size Medium and 59-63 cm in size Large. Since the Roc Loc Air Fit system wraps around the full circumference of the head, it is more adept at accommodating a wide variety of head shapes. The adjustment dial at the rear of the helmet is a little smaller than on some other models but is still relatively easy to manipulate with gloves on. The headband system also has 2 cm of fore and aft adjustment to allow for proper positioning of the helmet on your head.


Adjustable Y-buckles allow the front and rear chinstraps to be evenly tensioned and makes positioning the Y-buckle below the ear easy. Our only complaint is the fixed anchor position of the rear straps. The male end of the chinstrap buckle is adjustable, allowing the chinstrap to be tightened or loosened, but if your head falls outside the design size spectrum, it is possible that the buckle will not be centered under your chin. This was only a problem for one of our testers who had a greater distance from the top of his head to his chin. For the vast majority of users who fall within the size range based on head circumference, chinstrap adjustability should not be an issue.

Several advanced features like adjustable Y-buckles and a full...
Several advanced features like adjustable Y-buckles and a full circumference headband make it easy to dial in a perfect fit.
Photo: Nick Bruckbauer

Weight


Our size Large Synthe MIPS tips the scales at 312 grams, while the size Medium weighs in at 268 grams, making it one of the lightest models in our lineup. Most top-tier helmets on the market these days are equipped with a MIPS liner, meaning the Synthe MIPS is not really penalized in the weight metric by including the additional 20-30 gram liner. There are still some non-MIPS helmets available on the market, but in our opinion, the minimal weight penalty is a reasonable tradeoff for the additional crash protection.


Road bike helmets that have a more aerodynamic shape are typically heavier than their more traditionally shaped counterparts. While the Synthe MIPS is not a true aero helmet, it does provide a nice balance of some aerodynamic properties with a lower weight than most aero helmets.

This Editors' Choice Award Winner looks good and feels good in a...
This Editors' Choice Award Winner looks good and feels good in a variety of riding conditions.
Photo: Nick Bruckbauer

Style


We certainly think that this is a great looking helmet. Its snug-fitting low profile design looks far less awkward than most full aero helmets, and for the rider who only wants to buy one helmet, it provides a classic style with a nice balance of aerodynamics and low weight. The Roc Loc Air Fit System used on the Synthe MIPS is the best internal fit system we've used, allowing for an optimum fit. The classic design and modern color schemes are very professional looking.


Added special features like rubberized sunglass holders in the front vents enhance the functionality of the helmet, making it stand out among its competitors. We wish that Giro had included an extra set of pads and a helmet bag like some of its competitors, but these are small complaints.

Click to enlarge
Click to enlarge
Click to enlarge

Ventilation


The Synthe MIPS is a reasonably well-ventilated helmet, but it falls just short of other models with larger or more numerous vents. At high speeds, it seems like this model can compete with any helmet when it comes to ventilation; the feeling of air flowing over the head is noticeable. The Roc Loc Air Fit system is designed to cradle the head and suspend the EPS foam slightly above the head, and this feature is noticeable and does enhance cooling. When the road tips upward and speeds slow down, the Synthe MIPS does feel a bit warmer than other more heavily-ventilated helmets.


While it's not shaped like other more fully aerodynamic helmets, it is designed with some aero properties, and no matter how well-designed they are, these aero benefits always seem to come at the cost of ventilation, which is most pronounced at lower speeds.

The Synthe MIPS feels well ventilated at higher speeds and on breezy...
The Synthe MIPS feels well ventilated at higher speeds and on breezy descents.
Photo: NIck Bruckbauer

Overall, we feel that the ventilation is certainly adequate, and far better than the other dedicated aero helmets in our lineup, and on par with all but the most ventilated road bike helmets. The Synthe MIPS is a great all-around helmet, and we are willing to give up a marginal amount of cooling for an abundance of top of the line features, low profile, and semi-aerodynamic shape.

Durability


We did not experience any durability issues. The chinstrap buckle and headband tensioning dial worked flawlessly, and the X-static padding held up well and remained odor-free. The Synthe earns a respectable scoring in this metric but loses a few points because it has exposed EPS foam around the base of the brim that is prone to abrasion and dents during transport and storage. The highest-rated helmets in our lineup have polycarbonate shell material that fully extends around the brim of the helmet, increasing durability by limiting the amount of EPS foam that is exposed.


However, more polycarbonate shell material increases weight, so the helmets that score higher in the durability metric are generally lower scoring in our weight metric. Giro chose to limit the extent of polycarbonate shell coverage on the Synthe to keep the weight down, potentially reducing durability. We prefer a full-wrap shell, as it provides better protection from everyday bumps and dings, with a minimal weight increase.

Some of the EPS foam liner is exposed around the brim of the helmet...
Some of the EPS foam liner is exposed around the brim of the helmet, potentially exposing it to dings or dents
Photo: Nick Bruckbauer


Value


The Synthe MIPS is on the higher end of our lineup's pricing spectrum, but in our opinion still represents a great value because of its multitude of high-end features. This model is also less expensive than many other competing products with similar design features. Its versatility also enhances its value. For most riders, it provides enough aerodynamic benefit to prevent the need for a second full aero helmet.

Fast, light, and stylish describe the Giro Synthe MIPS. Will it also...
Fast, light, and stylish describe the Giro Synthe MIPS. Will it also describe you?
Photo: Nick Bruckbauer

Conclusion


The Synthe MIPS is a quiver killer helmet. It provides good ventilation, top-tier comfort, and a semi-aerodynamic profile all packed into a lightweight package, making it the perfect helmet for both training and racing. From long days in the mountains to flat days with crosswinds, the Synthe MIPS has you covered. It receives competitive scores in every rating metric, and tops the chart in several important categories, making it an excellent choice for racers or enthusiasts alike.

Nick Bruckbauer