This started as a normal square, camouflage fabric outside, fleece inside. After a few days it acquired a hole at the side and the girls The ratties preferred to be between the two layers! Next a door appeared in the side - easy access to the food bowl without coming right out! At one point Milly had her tail on one side of her head, while Poppy's was draped the other side. The bottom is now missing, but they have pulled bedding in and still love it!