And he has body fat :) Although he's gone from 220 to 185lbs since we moved here. But even heavier could not float. Yet, I don't even think about it and float easily.
I'm also convince you have to actually trust instinctively that the water will hold you and you won't drown.
My hubby barely swims. I have always taken lesson and even did the swim team for a yr in h/s. Yet, I am too claustraphobic to scuba.