Our unique Certified Organic moisture pads are made from Certified Organic wool from Pacific Northwest free range sheep. The sheep are not treated with antibiotics or hormones. They free range graze on lush fields that is not treated with pesticides or herbicides. This Certified Organic wool is felted here in the United States to create a perfect pad to resist liquids. No treatments, no plasticizers. You can machine wash ours as we oversize them to allow for the shrinkage. Hang dry indoors. Dries fast. Urine does not grow bacteria on these, so only wash if soiled.