Bamboobies Reusable Nursing Pads are made of ultra-soft and soothing bamboo rayon velour, an absorbent inner layer of cotton with an outer milk-proof liner to help prevent embarrassing leaks! These nursing pads are super absorbent and eco-friendly. Bamboobies washable nursing pads come in two varieties. The ultra-thin, heart-shaped regular nursing pads are made for light leaking and are designed to be less visible through clothing. The round shaped overnight nursing pads are not only ultra-soft, but larger, thicker and super absorbent for heavy leaking and newborn nursing.