375 technology active particle performanceso why exactly 375 well simply put 375176c is your ideal core body temperature while 375 is the optimum relative humidity in your micro climate 375 technology actually works to maintain this optimum balance so you perform better and in greater comfort no matter how high or low the intensity of your riding when you are in this ideal 375 zone you39ll be in your ideal performance zone so how does it achieve this perfect balance a laye