I think my wife bought the same or very similar. Came from amazon. Look for "peekaboo cat cave donut". It's kind of a rigid felt. Two pieces with a zipper that goes all the way around. It's a little small for our cats (about 9lbs). But I"m sure kittens would love it.
That’s awesome! I looked it up on Amazon. I might need to get one or two for my little shit machines.
