The Wool Moisture Protector is made of 100% Certified Organic Melton Wool which is tightly woven to absorb a substantial amount of moisture. The wool is naturally water repellant and dries easily. It is naturally flame retardant, dust mite and moisture resistant. A natural alternative to plastic and vinyl mattress protectors, It is also an ideal choice for children and babies. InBed Organics' wool is sourced from ethical vendors and is cruelty free.