The secret to my dives in cold water

I am the king of cold water diving:
Scuba 35 minutes in a wetsuit in 30 F water (-1C)
Ice scubadiving in a Bare artic wetsuit (7 + 7)

One of the reasons I am so tough is that I train myself. In the winter time, my thermostat is set at 65 F (16C). I haven't zipped up a winter jacket in decades. My showers are in lukewarm water.

Recetly, I have found why I may be more tolerant to cold. My fat percentage is 20.4%. In a male, fat is set between 10-20%. I should therefore reduce my body fat by 5-7%.

Over the years, my body has found a way to protect me against cold by building a layer of fat. Now, I am curious to find out if, by reducing my fat content, my tolerance to cold will diminish.

I will now raise my thermostat a few degrees, wear thicker underwear and dive in a dry to see if my body will reduce its fat content when it no longer is stressed out by the cold.