Product details:

The Hard Shell construction makes the helmet extremely durable due to the tough ABS plastic to absorb heavy impacts while optimized for style and ventilation. The Ratio MIPS features an In-Form fit system using a dial for easy on the go fast tuning, creating a comfortable custom fit. If that wasnt enough the Ratio fitted with an impact absorbing and lightweight EPS foam linerThe Ratio helmet has an adjustable Thermostat Control venting system, as well as Giros Stack Venting. Stack venting places a vent at the front of the helmet, aligned with the top of the goggles, this allows the warm, and potentially damp, air that comes from the goggle to quickly escape from the helmet, keeping you dry and comfortable.