Made with 100% domestic cotton fabric that has been pre-washed. I hope this will be helpful for taking care of your rabbit. Size: Approximately 23 x 24 cm Quilt batting is sandwiched in the flat areas. *Please use this product within the owner's sight while your rabbit is using it. If holes are made by digging or chewing, the batting may come out. *It can be washed, but hand washing is recommended to remove dirt, and using a washing machine is only recommended for the spin cycle. *Stains from urine, etc., may be noticeable on items made with light-colored fabric. Traces of a color pen may be visible on the fabric. This is a water-erasable marking pen used when cutting the fabric. I apologize if any traces remain. (They can be removed with a spray bottle or a wet towel.)