Yeah it's clumping which is why I'm worried. I guess I could switch it out for something that isn't. I've read if they have them inside the litterbox with clumping litter, the kittens can die. I just wouldn't want that to happen. She had a couple of options before because I had a rubbermaid box in there but she had no interest in it. She's been messing around in her "nest" for about 2 weeks now. Today I noticed that I could actually see her shoulder blades so the kittens are way back there.