Our pee pads are made of high quality fleece fabric on the top layer, soft and spongy wadding in between and waterproof layer at the bottom. However, the sewing process around the pee pad might allow small quantities of liquids through. Our pee pads are suitable for guinea pigs, rabbits, ferrets, chinchillas, mice, rats, hedgehogs etc. Washing instructions: Washable at 30 degrees only. Do not tumble dry, do not use fabric conditioner or softener. Due to shrinkage after washes, our pee pads are made slightly larger on each side. IF YOU NEED A CUSTOM SIZE THAT IS NOT LISTED HERE PLEASE REQUEST A CUSTOM ORDER WITH YOUR DESIRED MEASUREMENTS. IF YOU HAVE ANY QUESTIONS PLEASE DO NOT HESITATE TO CONTACT ME, I AM HERE TO HELP. THANKS FOR LOOKING!