I have used the band twice. My first time was during a barbell strength class wear I wore it the entire time. This is not a high-intensity class so your heart rate stays pretty consistent but does fluctuate when doing whole-body movements.
As I progressed through the class, I increased the cold temp and found it to provide me with energy.
The heat being drawn from my body was very apparent. The second time I used it was after a kickboxing class. I immediately put it on for about 45 min after my workout. Immediately I felt the heat being drawn out and felt great afterwards.I would like to try it in a hot yoga class and again in some other HIIT classes.