Leakage causes huge problems for any breastfeeding moms, we added an extra layer of bamboo to ensure maximum absorption of your breastmilk. The top layer is also made waterproof to ensure that you don't encounter wet milk spots on your outerwear. Shaped perfectly for your nipples without awkward bulging of the pads. Safe for babies to latch on after use. Organic Bamboo is the softest and most absorbent fabric that we have to offer, giving the best comfort for your sore nipples all day long!