Early morning runs, unexpected weather conditions on the back nine, biking your favorite forest trail or making your living on the golf tours. X-series, abacus' most versatile, technologically advanced, light weight and state of the art collection has you covered. Utilizing the unique 37.5® Technology, with active particles from coconut shell and volcanic sand embedded at the fiber creates the perfect “micro-climate” of 37,5 degrees Celsius inside your garment. This is your absolute ideal performance zone.