The SO and I camped this past weekend and my azz got cold.

A few facts: Used a 20 degree full length UQ. Night time temps reached the mid 20s. Little to no wind. My top side was fine, warm actually. My back was fine. Most of the night my feet were fine. At one point I put the palms of my hands under my azz and felt the temp of the hammock underneath me. That area didn't feel cold to the touch, more like room temperature.

Any ideas of why this part of my body felt cold while other areas were fine?