A perfect blend of performance and style, this Traveler suit separates jacket, powered by 37.5© Technology maintains the optimum microclimate for your body. 37.5© Technology removes moisture at the vapor stage before sweat can form, acting like a thermostat. 37.5 Technology provides maximum mobility with performance stretch lining. 37.5 Technology also absorbs and traps odor molecules that are washed away when cleaned. What's great about suit separates? You can choose jacket, pant and vest sizes separately for a perfect fit.