Our wool nursing pads are made from two layers of the finest and softest Oeko Tex 100 certified Merino Wool. They are larger than our Cotton and Hemp nursing pads at 5″ across. Wool is highly absorbent and is naturally breathable so it is an excellent fabric for nursing pads. It does not need to be washed with each use. Simply let dry. Wash cold and lay flat to dry. Do not lanolize.