Millets Basket Close Menu Search Store Finder Twitter Facebook Instagram Blog Engage voice search Offer logo Click and collect logo Delivery logo
Choose size in stock:

Selected size:

2 other colours available

Combining comfort with superb performance, the Giro Sonnet Helmet offers great ventilation all thanks to the 25 Wind Tunnel™ vents and the adjustable Roc Loc® 5 fit system which enhances comfort and allows you to easily custom tune the fit in seconds single handedly. The In-Mold construction combines a tough polycarbonate outer shell with an impact-absorbing foam liner.

View product information

Product code: 139098


  • A versatile technical cycling helmet that guarantees to keep you protected
  • In-mold polycarbonate EPS Liner - Provides enhanced protection by spreading impacts across a wider area
  • 25 Wind Tunnel™ vents – Enhances ventilation so your head feels cool
  • Roc Loc® 5 fit system – Enhances comfort and allows you to easily custom tune the fit in seconds
  • Womens series design - A diverse collection of helmet styles, fits and prices tailored to specifically to female riders

Delivery and collection options


Ratings & Reviews

Currently No Reviews

Please help us by writing a review of this product.

Write A Review