Babee Greens' wool nursing pads are made from two layers of the finest and softest Oeko-Tex 100 certified Merino Wool. Wool is highly absorbent and is naturally breathable and naturally anti-bacterial and anti-fungal.  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.