I have an spherical aluminum Momo knob on my GTV6. After that one hot day parked all day in the sun after I just put it on..went to shift after starting the car-OUCH!!! It felt like grabbing a hot cast iron pan!
After that experience, I'm more aware now when parking my car.
Use a windshield sunshade, shade the knob, carry driving gloves, and park in the shade, all depending on your level of sadistic pleasure.