Hemp inserts are more absorbent than microfiber and bamboo inserts. Hemp has the ability to retain moisture under pressure and are ideal for overnight usage. It is made of organic cotton and natural hemp that can absorb moisture 8 times better than cotton. The insert is made of hemp cotton on one side and quick dry suede cloth on the other side. This side must be in contact with the baby’s skin. Thiese inserts are reusable and machine washable upto 100 washes. The more you wash more absorbency. Can last upto 6 hours!