We make our venerable A/C Shirt with a breezy 100% organic cotton fabric (that feels as good as an open schedule) to offset the effects of equatorial heat and humidity. The ultimate warm-weather performance shirt, its crepe-like fabric features fast-wicking properties and an open weave provides maximum airflow. It has a button-front placket, a button-through chest pocket and side vents at the straight hem to allow a greater range of mobility.