The Sadie show shirt blends cutting edge technology with traditional styling to form the perfect synergy. The fabric features 37.5® patented thermoregulation technology which has proven to help your body manage its core temperature and therefore, increase stamina. It keeps you comfortable by helping your body to maintain an optimum core temperature of 37.5° Celsius (99.5° Fahrenheit) which is ideal for peak athletic performance. The particles are naturally derived and work for the life of the product (it will never wash out!) This style also features multiple trim fabric options and a zipper placket with snap collar to modernize this traditional look.