I have to say this is one of my most favourite massages hot stones massage is an amazing experience the stones themselves are volcanic stones from mexico it is known that the temperetures from volcano39s can sore in to the thoughsands of degrees of heat and that is why they are chosen for this treatment use the stones are heated in a special heater and then are used to massage with obviously not at the same heat as the vocano39s but at a bareable heat however if at any