UD’s comments are accurate. I would add that the glans will sometimes feel cool to the touch naturally and wearing the Innerwear (even when properly sized) will have a more frequent cooling effect, which comes and goes, however, it is nothing to be overly concerned about beyond a few jelqs to engorge the glans whenever you have the chance.
Again as UD mentions, you need time to experiment to find your optimum set-up and also to condition the penis to wearing the devices over time for longer periods.
