That's a little confusing

I realize that I'm a strange person. The other day I was reading my body wash bottle. You know, Softsoap brand.

Then I saw something pretty interesting:

My soap is soap-free. Now if I were a really great blogger, I'd probably do some research and see what that's all about, but I'm not, so I won't; and I'm just confused as to why my soap is soap-free.

But I guess the other day when I used shampoo as soap on accident, it didn't really harm me at all. (That was a half asleep shower)