We just recently came across a few athletes that were training with the mask on. I think this should be reserved for high end professionals who know what they are doing as this device does come with risks as it is limiting airflow. That being said the few athletes that we have come across are highly trained and enjoy using it.
Having said that, have any of your trained in our Performance Cooling Vest? Take a look at the research behind the product as many leading professionals and universities agree that cooling the core increases athletic performance and overall comfort. If you have any questions regarding the product or our trainer program please do not hesitate to ask!