Diaper liners really make cloth diaper laundry a lot easier. They are a sheet of fabric made of bamboo fibers, about as thick as a sheet of toilet paper. They are placed between the baby and the cloth diapers. They do not add additional absorbency. Instead, they allow urine to pass through and solids stay on the diaper liner. You can then drop the poop and the liner into the toilet or garbage and your cloth diapers are less messy and your diaper pail odor is not as strong.