Wool Moisture Pad: Is made of 100% pure wool. It provides excellent protection to your mattress making it an ideal choice for children, the elderly or infirm sleepers. The wool is naturally water resistant and dries naturally. Fits mattresses up to 12-inches in thickness and has 2-inch wide elastic straps. Is approx. 1/4" thick. Organic Cotton Mattress Pad: Is made of 100% organic cotton. It provides excellent protection to your mattress. The Organic Cotton Pad will keep you mattress looking newer longer. Helps provide a softer more luxurious feeling mattress