PureTree organic cotton surface washable nursing pads is designed to be super comfortable and super absorbent, and environmentally friendly. Organic cotton surface is especially weaved to allow good pass through of breastmilk while super comfortable and soft on mother's skin. The two absorption layers provides extra absorption power. The fourth waterproof layer prevents leakage of milk. Organic cotton surface nursing pad is 4.5" diameter across for good coverage and designed with a bowl curvature shape to more effectively capture breast milk. PureTree washable nursing pads are recommended to washed in a zippered garment bag in cold water or handwash with gentle detergent and air dry.