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Tenjay, how many dives did you take over how many days. The cooling effect is cumulative. Even in warmer waters I end up wearing a hood after a couple of days or a cleaning wrasse trying to clean my ears on manta dives.
Everyone is different and if your furnace is always fired up, then maybe OK in less coverage. Just don't come complaining to Alison and me when you end up cold or stung. Jk
In 81 degree Fahrenheit waters I even add a chillguard under my suit. But I'm diving multiple dives, multiple days.