Hemp is known for its great absorbency properties. However, because it absorbs very slowly, it is often paired with cotton as in these inserts. Both of these fibers can withstand pressure better than microfiber (i.e. fewer compression leaks). They are useful for heavy wetters or as a booster for nighttime.
To prep: Wash at least three times before use. As you continue to wash them, their absorbency will increase. They can be used against baby's skin.