It is very gentle, and makes it very easy to apply your topicals to your back. None! I haven't actually used it for the lotion as they advertise it for. But I used it in the shower to apply the regimen gentle cleanser to my back.
I was a bit skeptical at first about how it would feel on my skin, and how well it would spread the soap around. However, my skepticism soon vanished as soon as I put it to use. It, glides over your skin, and feels incredible...very gentle. And it works up a very nice, even lather.
Also, it is very easy to clean, as it is made of soft, leather-like, vinyl. You can just rince it off in the shower, or wipe it with a damp cloth when using it for BP or moisturizer.
A great buy!