The one and only time I wore one was when I was a 17-year-old kid in the U.S. Navy. Had to put the suit on in three minutes or less, jump (fall) into an ice-cold pool, stay there for an hour, then try to climb out. I tipped the scales at 140-pounds back then and was 6-feet tall - nothing on the suit sealed when a kid that skinny wears it. I got pretty wet, damned cold, and had a lot of trouble climbing out of the pool using the steps at the end. It was a training exercise that I wasn't sure I would survive. Damned, I'm gettin' cold just thinking about it.