Our unique moisture pads are 100% Wool. Pure and certified organic wool from United States is felted here in the United States to create a perfect pad to resist liquids. We sew them in our own facility to ensure purity. Softer than competitor wool pads so you don't get that itchy feeling. No treatments, no plasticizers. This features wool on sides as well for total protection and fit. Elastic all the way around and fits all standard crib mattresses. 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. Crib Fitted Size.