The original Synthe established itself as a fixture in the professional peloton when it launched in 2014, balancing aerodynamic performance with ventilation in ways that competitors struggled to match. The Synthe MIPS II carries that legacy forward while integrating rotational impact protection that the original lacked. Giro positions this helmet for road and gravel riders who want the benefits of a compact, wind-cheating profile without sacrificing cooling on long climbs or hot days.

Nineteen vents channel air through the helmet using Giro's Wind Tunnel ventilation system, which pairs intake ports in the shell with exhaust channels molded into the EPS liner. The design moves fresh air over the scalp while pushing warm air out the rear, and the Roc Loc 5 Air fit system enhances this by suspending the helmet slightly off the head to create additional airflow between skull and liner. This suspended cradle also handles fit adjustments through a single rear dial that controls both tension and fore-aft tilt, allowing one-handed fine-tuning while riding.

The Integrated MIPS system combines the slip-plane layer with the retention system rather than treating them as separate components. This approach reduces weight compared to older MIPS implementations while maintaining the rotational force management that the technology provides during angled impacts. Beneath the outer shell, Roll Cage reinforcement adds a web of structural support molded into the EPS foam, helping the helmet maintain integrity under impact loads that might otherwise cause the liner to fragment.... Read More