Size S: Inner size: 13" x 7", outer size: 16.5" x 11", fit for small animals like kitten, puppy, rabbits, hamster etc. Cat Bed: The edge of the mat is raised to make it more comfortable for pets curling sleep. Designed to use with pet crates, cat carrier or cat tower tree, once the size is suitable, you can place it anywhere as your pet like. Soft and Warm: This pet mat is padded with polyester, it is soft and comfortable, machine washable for easy clean.