Pardon me for being naive in my question, as I wanted to ask that based on basic knowledge that dark colored objects attract and retain more heat than lighter colored ones. And since we wear this device (apple watch) directly on our hands, I wanted to know which one retains less heat ... So based on that people who have experience of using both the watch cases, did you feel less heat on one compared to the other? Edit: I am talking about heat in terms of running outdoors in the sun (temperature outdoors being 86F/30C and up) for more than 10k. Or driving for long distance and your left hand with the watch on, getting baked in the sun.