37.5® Technology is a thermoregulating technology that uses natural patented active particles embedded into the yarn of the fabrics to enhance the the performance of the material. 37.5® Technology helps the body to keep the ideal core temperature of 37.5° Celsius and helps keep the microclimate next to the skin at the ideal relative humidity of 37.5%. The technology also works as a temperature control, when you’re hot, patented active particles embedded in the material remove sweat in the vapor stage before liquid sweat forms, cooling you down. When you’re cold, those same active particles trap your energy to help warm you up. 

37.5® Technology is the only thermoregulating technology to combine natural active particles plus enhanced biodegradation and recycled yarn options. You do not need to chose between performance and sustainabillity