This crib size flat wool moisture pad is made from Natura Cry Less Wool. It provides a water repellant and natural barrier for spills and leaks. No harmful toxins, off gassing, bleaches or dyes. Wool is naturally flame retardant, mite resistant, moisture resistant- a natural alternative to plastic and vinyl mattress protectors. As with all wool moisture pads, it works best with a cotton mattress pad layered on top. Machine washable (cold water, gentle cycle, flat or line dry).