The Ratio got its name for a reason and it is not because the quantitative relation between two amounts showing the number of times one value contains or is contained within the other. The Ratio is Giro's perfect balance of protection, style and value. Combining MIPS with Giro's Thermostat control system, the Ratio can be worn comfortably in almost any weather condition without worrying about sacrificing protection. It looks pretty slick as well.