Let me start off by saying that this is easily the best running specific cap I’ve ever owned.
I’ve used the Q-Cool cap extensively now for a few months in a range of conditions (Heat, humidity and even alpine winds) and it’s easily the most versatile and best fitting cap I’ve used. I personally love how pliable the brim is (can comfortably squeeze into pockets for trails) and the unique sweat wicking band inside the brim always means less sweat running down my face. Overheating is certainly not a problem either with fantastic breathability.
I would highly recommend this to anyone that enjoys their running !