The inner layer is made of a soft double fleece, which helps wick the moisture away from the baby's skin and helps to keep the baby dry and comfortable. (babymilano.com)
The fleece interior lining of pocket diapers are great at helping wick moisture away from baby's skin for better sleep and to distribute the wetness overall for more uniform absorption. (diaperjunction.com)
These types of liners don't wick the moisture away from the baby's bum so I wouldn't suggest using them with every diaper. (mygreennest.com)