I can't remember exactly what was in the mud, maybe clay based? It was 20 years ago! I remember the room had two cement 'tubs' that they filled with warm mud and my friend and I certainly had a good laugh about it all. The showering off was hilarious because from there we were going to some type of a body wrap and then a massage. One of those nifty removable shower heads or at least a hose would have been more effective!