Marine Times article, page-2

We know that the Fire retardant would be Alexium's products but could the military be also testing Alexicool?

-' New combat shirts include cooling material in the torso and collar. Companies that make cooling materials claim the special fabric can absorb sweat and create a cooling effect as the shirt dries. Soldiers also tested a version designed to draw sweat away from the body so it can evaporate more quickly. '

Possibility. Although they are saying special 'fabric' not 'treatment ' , but could just be they way it is reported.
I dare say Nick with his close relationship with the military would have had ample opportunities to mention 'this new cooling treatment we have' over the last couple of months into the right ears.