Do these rugs have a backing of some kind?
Yes, it as a No-slip backing
These bath mats are fabulous! So glad I purchased. Soft and smooth.
YAY! Glad you like them.
I am interested in the white mat. Can I use bleach to clean the mat in the laundry machine?
I’m now expert but with the non-slip backing, bleach might be kinda rough on that. Maybe a non-bleach whitner?
Thank you for the advice. I just ordered the “white” color, and I am on my way out to buy some baking soda as a substitute to bleach. Thank you 
YAY! Glad I could help.
You could do what I do and never buy anything white. LOL