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Giro Synthe Helmet

Helmet Size
159.95€ 109.05€ discount
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  • Free tracked delivery to Ireland
  • Trustpilot review 9.3 out of 39.847 reviews

  • Aerodynamic helmet and yet well-ventilated because of the 16 vents.
  • Compact design looks good on your head.
  • Finish.
  • Slightly inflexible straps.
Read more on what our customers have to say about this product
Brand Giro
Model Year
  • 2017
Type of Racing Helmet
  • All-round helmet
  • No
All specifications

The Giro Synthe is the pinnacle in Giro's helmet design. This modern helmet has impressive cooling performances, minimal weight, a perfect fit, and a sleek aerodynamic efficiency. This helmet makes a big difference during extensive wind tunnel tests. These tests clearly showed the Synthe is as aerodynamic as most time-trial helmets. The best features of this helmet are comfort and ventilation. In the heart of the helmet you will find the Roc Loc Air Fit System.
With this system the helmet is slightly suspended over your head, so as to create an optimal air flow. It is possible to adjust the tension and the front or rear overturning. You no longer have to choose between aerodynamics and ventilation: with the Synthe you have it all!

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Model Year 2017 2017 / 2019 2017 2018
Type of Racing Helmet All-round helmet All-round helmet Basic helmet All-round helmet
Helmet Size S / M / L / 51 - 55 cm S / M / L / 51 - 55 cm S / M / L S / M / L / 52 - 56 cm
Colour Matte Black / Matte Silver Bright Red / Matte Black / White / Fluo Yellow / Matte Black / White / Silver / White / Red Yellow / Red / Black Matt Black / Mat Black Chrome
Head Circumference 51 - 55 / 56 - 59 / 60 - 63 60 - 63 / 51 - 55 / 56 - 59 52 cm / 53 cm / 54 cm / 55 cm / 56 cm / 57 cm / 58 cm / 59 cm / 60 cm / 61 cm / 62 cm 52 - 55 / 56 - 58 / 59 - 61
Weight 215 grams / 234 grams / 264 grams 286 grams 216 grams
159.95€ 184.95€ 119.95€ From 144.95€
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9.2 / 10

187 reviews

  • Comfortable (7)
  • light weight (7)
  • light (5)
  • Ventalation (4)
  • Expensive (3)
  • Finish quality (1)
  • full price would be expensive (1)
  • None (1)

Most recent reviews

Matthew, 19 October 2018

Fantastic price - cheaper than crash replacement price

Stuart, 24 September 2018

Light and well ventilated

Pretty much as expected for the price.

  • Weight
  • Ventilation’s
  • Finish quality
Steven, 20 September 2018

perfect fit super light feel

Feels like a top end product i had an accident in this helmet and it saved me from serious head injury

  • quality product
  • full price would be expensive
Gary, 27 July 2018

Superb cycling helmet

Looks fantastic, really light weight, very comfortable and my head remained cool even on tough 100 mile route recently. Mantel company I can’t praise enough. Really easy purchase, informative emails kept me up to date with tracking and a final thank you message for using them. I will definitely use Mantel in the future for further cycling gear and would definitely recommend to others.

  • Light weight
  • Comfortable
  • Great price from Mantel
  • Keeps your head nice and cool
  • None
Greg, 24 July 2018


Light, comfy and a great fit. Super stylish too. I am on my second of this helmet. Both bought from mantel.

  • Comfy
  • Stylish
  • Solid Fit
  • Good Price from Mantel

Detailed product description

Roc Loc Air Fit system:
The Giro Roc Loc Air system is specially developed for the Giro Airo helmets. This new system ensures the helmet floats a little bit above your head. As a result there is a good airflow over the top of your head what ensures a good ventilation. Just like the Roc Loc®5 system the helmet can be easily fine-tuned. The tension around the head and the vertical position can be adjusted with one hand. With this Giro sets the new standards for ventilation and comfort.

Wind Tunnel Ventilation:
Giro helmets are developed using its Giro Wind Tunnel ventilation system. This system combines the active vents with the internal ventilation outlets. This combination ensures a cool, fresh air flow over and around the riders head, while forcing the heat and stale out. The renewing of these ''air channels'' turns out to be a huge success. The riders were real enthusiastic, they noticed the new ''air flow'' around their head, resulting in a better cooling!!

In-Mold Construction:
The In-Mold Construction combines a strong polycarbonate outer shell with
shock absorbing helmet padding. Thanks to its fusion process it is possible to sculpt a better ventilation system, so the In-Mold helmets are lighter and cooler than most traditional helmets.

X-static Padding:
Besides the fact they are comfortable The X-static pads ensure anti-microbial properties to keep your helmet longer clean . The pads are machine washable.

Additional information

• Wind Tunnel Aided Design for aerodynamic efficiency on the road
• Integrated Aero Mesh Panels (ideal storage place for your glasses)
• Super Lights X-Static pads
• New composition of EPS foam, lighter and stronger than before
• 19 vents; designed and shaped with wind tunnel technology
• Roc Loc Air system
• Weight: 233 g (size M) (weighed by Mantel Bikeparts)
• Sizes: S (51-55 cm), M (55-59 cm), L (59-63 cm)