Shirley, It has been so long since the hyster that I reayyl don't think that is it for me.
It is really great (? not really)when the sweat is so bad that even my small chest has sweat marks and then there are the times that I need a paper towel to wipe down my neck, face and chest.....even my shoulders.
The reason that I don't think it is from the hyster is that the heat does not start in at the chest and raise to the head like it did at first. It can be any part or all parts at once.........ain't it fun......not so much