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  • Giro Sonnet Helmet - Women's
  • Giro Sonnet Helmet - Women's
  • Giro Sonnet Helmet - Women's Side
  • Giro Sonnet Helmet - Women's Side
  • Giro Sonnet Helmet - Women's 3/4 Back
  • Giro Sonnet Helmet - Women's Back
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GiroSonnet Helmet - Women's
Sale 35% Off$64.97 - $69.96

Item # GIR0409

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  • Matte Bright Pink,S ($64.97)
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Item # GIR0409

Designed for the rider who appreciates comfort and protection, the Giro Women's Sonnet Helmet has a low-profile design that still packs in excellent ventilation. The Sonnet's In-Mold technology bonds a tough outer polycarbonate shell to an impact-absorbing expanded polystyrene liner.

The result is a light and structurally sound helmet, and, to make sure the Sonnet fits correctly, Giro's Roc Loc 5 system lets you dial in both tension and vertical positioning with a single hand. To accomplish this, the Roc Loc 5 uses a ratcheting, micro-adjusting dial to open or close the retention system. For up and down adjustment, a three-position bracket provides 15 millimeters of movement without removing the helmet.

The Giro Sonnet Women's Helmet comes in sizes Small and Medium and in the colors Matte Black/dynasty green modernist, and White/rhodamine.

  • In-mold technology
  • Low-profile design
  • Excellent ventilation
  • Roc Loc 5 system
Tech SpecsSize
Tech Specs
Shell Material
Impact Foam
EPS foam
25 vents
Fit Adjustment
Roc Loc 5
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.

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Very comforatable

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

I bought this for my wife. She doesn't like to wear a helmet but this one is so comfortable that she likes wearing it. Looks nice it fits really well.

Avg. ride time: 34m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

solid helmet

  • Familiarity: I've used it once or twice and have initial impressions

good fit, light, aero and good all around helmet

why are you reviewing a women's helmet?

Summer ride

It was selfie Sunday.. couldn't resist showing off my new gear!

Summer ride

Is it Vented? Do you get hot wearing a black helmet?

It does vent well and didn't get too hot, but I must admit I haven't ridden in temps higher than about 75 degrees.