I use a scuba pro semi dry for caving and sump diving. I can get by because the water is shallow and even at 58 degrees I can stand it. I can do that for about 30 min. of deco but if I have to deco for any longer than that I have to go to a dry suit. The chance of DCS is just too high if you are shivering and trying to deco for more time than that. Also I have found that the fine tuning for really carefull bouyancy control is better if I have a dry suit. Right now for really small stuff when not sump diving I use a harness with my dry suit is my primary source of inflation. It depends on what I am trying to get done in a cave as too what kind of suit I use. Cindy Butler