Road Helmet GIRO Helios Spherical, matte white, size M (55–59 cm)

GIRO Helios Spherical in matte white is a road cycling helmet sized M (55–59 cm) that combines lightweight construction, integrated ventilation and Giro's Spherical Slip Construction for improved rotational impact management. The helmet is designed for cyclists who need a balance of aerodynamic profile and airflow for training, racing and long-distance rides while maintaining protection standards expected from a performance road helmet.

Advantages

The Helios Spherical offers a compact, aerodynamic shell with strategically placed vents to promote airflow without compromising structural integrity. The Spherical Slip Construction is engineered to reduce rotational forces transmitted to the head in oblique impacts, and the helmet’s retention system and fit adjustments enable a stable, personalised fit within the 55–59 cm size range. The matte white finish provides low-glare aesthetics that suit varied riding conditions.

Suitable for

• Road training sessions and group rides
• Club and amateur road racing
• Long-distance endurance rides and gran fondos
• Cyclists seeking a lightweight, ventilated road helmet with enhanced rotational impact protection

When it may not be suitable

This helmet is optimised for road use; it may not be the best choice for off-road disciplines such as mountain biking where additional coverage and different vent placement are desirable. Riders who require very small or very large sizes outside the 55–59 cm range should consider other size options.

Key specifications

• Size: M (fits head circumference 55–59 cm)
• Shell finish: matte white
• Construction: Spherical Slip Construction for rotational impact management
• Ventilation: integrated vents for airflow and cooling
• Fit system: adjustable retention and straps for personalised fit
• Intended use: road cycling, training, racing, long-distance rides

How to use

Place the helmet level on the head so the front edge sits just above the eyebrows. Adjust the retention system at the rear and tighten the chin straps so the helmet remains stable but comfortable; you should be able to fit one or two fingers between the strap and your chin. Inspect the helmet before each ride for visible damage and replace it after any significant impact. Follow manufacturer care instructions: clean with mild soap and water and avoid exposure to solvents or high heat.

What to consider before purchase

• Measure head circumference accurately to confirm the 55–59 cm size is appropriate
• Consider the type of riding you do (road vs. off-road) to ensure the helmet’s design matches your needs
• Check compatibility with accessories such as sunglasses, communication units or rear lights
• Verify local safety standards and certifications if required for competition or insurance

Usage recommendations

For optimal protection and comfort, adjust the retention system each time you put the helmet on, replace the helmet after a substantial impact, and pair the helmet with properly fitted eyewear and reflective or visible clothing during low-light rides.