Crib Wool Moisture Pad: 1/8" layer of moisture resistant 100% pure grow wool. Designed to hold 8 ounces of water over an eight hour period, this is the best way to protect your crib mattress. No need for plastic covers. Wool naturally resists mildew, bacteria and dust mites. You may wash the pad by hand or in the delicate cycle with cold water and hang dry. NEVER PUT IN DRYER OR IN DIRECT SUNLIGHT WHEN WET. Dries within hours. You can add the organic cotton mattress pad for extra comfort and absorbtion protection. item #00083 )