For cooling, I take a large triangular cotton (Do rag) bandage, soak it in water, drop the point down my back, between my t shirt & outside shirt. I then bring the two other points up on each side of my neck, loosely cross the two ends and push them down the inside and front of my shirt. This usually keeps me cooled down for 2 hours whether I am sitting in a hot cockpit on a tarmac waiting for take off clearance or biking, or hiking. It's usually very hot and a high humidity here in South Louisiana and the evaporative cooling is a life saver.