I used to believe that shaving cream was only good for seeing where you already shaved, but after a while i realized that it really does help condition and lop hairs off more smoothly. I reckon a decent soap lather could do the same thing, but may cause irritation (bumps) because soap is more drying than conditioning
I don't use shaving cream or soap. Just hot water in the shower. I get a great shave without any irritation.
