Staying warm between dives

[nellamit]

In my experience, from my days of cold water wetsuit diving, the idea was to use warm water, not hot water. The idea is to pre-fill the wet suit with warm water to prevent the surge of cold water when you first enter the water. This way your body does not waste heat enrergy in the initial heat exchange. The water you pour in your suit should only be a little warmer than body temperature.