The inside of the tower is lined which is nice and the tower entrances have a soft fur lining too. My only issue is that I wish my cat could access all three levels from the inside but the top level is one solid piece so you can only get in there through the outside. I also think the wood material used to make the tower might be a bit thin.
https://www.amazon.com/Pawmona-Natural-Sisal-Covered-Scratch-Washable/dp/B0844VQH5K

