My daughter is good with the sewing machine and I'm hoping to move over to fleece bedding to save some money... I'm thinking she could just sew me some fleece cage liners for the pigs. But the ready-made ones I use have a water-resistant bottom lining and a middle absorbent layer and I like those features, I'm not sure how I could replicate that in a homemade cage liner. Any ideas of what to look for at the fabric store?