We made this top for the rigors of indoor training. The 3D Mesh fabric allows maximum airflow for cooling while wicking away moisture to keep you dry. We made it on the limit of not being too transparent in case you want to wear it for group training sessions. We put a zippered pocket on the back so you can stash your AirPods or phone or headband or whatever you haul to your training station. We've kept the collar low and the length short for maximum cooling.