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Sonnet Helmet - Women's

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Sonnet Helmet - Women's

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
  • Item #GIR0409
Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older
Fit Adjustment
Roc Loc 5
25 vents
Manufacturer Warranty
1 year
Shell Material

Overall Rating

5 based on 2 ratings

Review Summary

5 Stars - 2 reviews
4 Stars - 0 reviews
3 Stars - 0 reviews
2 Stars - 0 reviews
1 Stars - 0 reviews

Fits Small

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Runs smallTrue to sizeRuns large

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