Review (1/5): Silicone rubber is the wrong material for scrubbing skin.  No soap hold and no texture.
This applies to *ANY* silicone "scrubber". It is like trying to wash dishes with a ziplock bag on your hand as the dishcloth - first, soap doesn't get held like it would be a cloth or brush. Second, the thing is smooth and so it has no cleaning quality of texture and abrasion. I'm going the throw them away, and get brushes or something that is basically a cloth strip. Yes, this material stays clean, packs easy, is cheap, lasts forever. I love silicone rubber as a material. But not for back scrubbing.