Check out the pictures and information from Master Mike:
It has a nice thick comfy cushion, a kennel heater to keep you toasty warm, and a LED light if you want to do some reading or just see what you are sitting in. It is completely dark with the light turned off. The door and heater are controlled by redundant timers, so there is no chance of getting stuck in it. So long as you don’t exert yourself too much, there is plenty of airflow. I find it quite relaxing.
Thanks, Master Mike, for these pictures and the information about your confinement box! Fucking HOT!
(Note to readers: Yes, I have been inside and it is just as cool as it looks!)