The AC37 pad is a feat of science. For starters it features NASA-designed ComfortTemp technology to keep the pad temp constant at 37ºC/98ºF. The chamois also uses a triple layer, thermowelded multi-density foam for seamless comfort and progressive damping, making sure the cushioning always cushions. Finally, each of these three layers have additional perforations which provide even more airflow and breathability to the pad.