This Traveler® suit separates jacket features a unique fabric technology that maintains the optimum microclimate for your body. Featuring 37.5© Technology, maintains the optimum microclimate for your body. 37.5© Technology removes moisture at the vapor stage before sweat can form. 37.5 Technology also acts like a thermostat by removing moisture when you are hot and retaining warmth when cold. It absorbs and traps odor molecules that are washed away when cleaned.Matching Pants: #3XV6Matching Vest: #3XV8