Welcome!
I read this post not long ago on here about the shamwow. I'm not familiar with them, but it's not something I personally would choose to use, after reading this.
http://www.guineapigcages.com/forum/...e-shamwow.html
We use fleece sewn to mattress pads. I got the idea from this forum. I bought a king-sized cotton-rich mattress pad & cut it up into the various sizes we needed. It works well for us, and we've had it for a few weeks (maybe a month) now.