I've looked up Borris Mats at IKEA. I don't have an ikea but I do have a friend that frequently visits her daughter and they go to an ikea. So, I can actually get them without having to pay the outrageous shipping cost. Currently, I use the Uhaul mats with success. But, my girls are starting to chew them. The Uhaul mats are $12 and my Uhaul location will not sell the old mats. So, I was looking for an alternative and read about the Borris mats. Wow! They are cheap! I have a few questions:1. Are they absorbent? The website only says they are polypropylene with a latex backing.2. How many is needed for a SCN?3. Do your rats chew them up?4. Do you cover them with fleece?