Independent testing validates what riders feel on the road. Virginia Tech's bicycle helmet ratings ranked the Aries Spherical first among 210 helmets tested, awarding it their lowest-ever STAR value score of 8.40 and a 5-star safety rating. Giro achieved this result through Spherical Technology, a ball-and-socket construction powered by Mips that allows the outer EPS liner to rotate around the inner liner during angled impacts. This design redirects rotational forces away from the brain while eliminating the hard plastic slip-planes that contact the scalp in traditional Mips implementations.

Protection alone doesn't define a race-worthy helmet. At 265 grams in size medium, the Aries sits among the lightest road helmets available while incorporating dual-density Nanobead EPS foam through Progressive Layering. This construction uses different foam densities to address both high-speed and low-speed impacts, providing comprehensive energy management across crash scenarios. The Aura II Reinforcing Arch runs throughout the shell structure, a shatter-resistant translucent element that maintains structural integrity while enabling the massive vent openings that define the Aries profile.

Ventilation engineering pushes airflow through 24 Wind Tunnel vents paired with deep internal channeling carved into the inner liner. Cool air enters through the shell vents and follows these channels across the scalp before exhausting through rear ports. The Roc Loc 5+ Air fit system enhances this cooling by suspending the helmet slightly off the skull, creating an additional airflow path directly over the head. Single-handed adjustment lets riders fine-tune tension and fore-aft tilt without stopping.... Read More